Morphological characteristics of perignathus

Body length1.1mm ~1.5 mm. reddish brown is slightly shiny, and the head, chest and abdomen are dark, especially the head and chest are almost dark brown, and the chest and abdomen, abdominal stalk and first abdomen are light. The antenna section is brown; Maxillary, one eye is brownish red; The chest side plate and webbed are reddish brown with yellow; Three pairs of foot, mandible and lower lip complexes were dyed yellow; The wings are transparent, and the veins are the same color as the antennae.

The frontal view of the head is wider than the height (24∶ 19), and the middle of the antenna fossa is located on the lower edge line of the compound eye. The antenna has 1 1 nodes, and the sum of the lengths of the stem node and the whip node is equal to the head width (rear view); The lower edge of the antenna recess extends downward to the base of the lip base, and the face protrudes highest at the base of the lip base. There are 1 pits on both sides of the base of the lip.

The distance between the monocular on both sides is twice that from styloid process to the middle monocular. The distance between jaw and eye is obviously smaller than the mouth width (5∶ 10).

In addition to the 1 row of bristles at the rear edge of the back plate of the chest, there are also thick black short hairs attached to other parts. About 30 bristles are scattered on the leaves of the middle thoracic dorsal piece; The bristles on the two leaves are also dense, but there is no hair on the triangle. The shallow and thin reticular engravings on the middle chest shield are obviously dense and small, which seems to form a vertical line of 1. The small shield in the middle chest is slightly octagonal, and its length and width are almost equal, but the two back corners obviously extend outward, making the back of the small shield wider. The ratio of the width of the small shield in the front 1 pair of bristles to the width of the back corner is 9:10.5. Two pairs of long manes on the small shield are attached to the sides.

The length of the front wing is twice the width, and there are two hairs on the front of the basal chamber in the middle of the end; The cilia in the outer area of basal cell are slightly thinner than those in other areas of wing surface; There are hairs on the basal vein, and there are 1/2 cilia in the cubital vein and the vein under the corpus callosum. The bristles on the marginal veins are obviously longer than those on the nevus veins. The length of secondary marginal vein, marginal vein and nevus vein is 12: 19: 5.

The back length of abdominal stalk is 1/2 of the length of thoracoabdominal segment. The abdomen is round, with equal length and width, and the back is shallow collapse, and the abdomen width is obviously larger than the chest (28∶2 1). The abdominal length is slightly shorter than the chest length (28∶30). The abdomen is widest at the second back edge and the third front edge, and gradually narrows forward and backward; The seventh section is the smallest, and the cone is located at the end of the abdomen. The ratio of the length of each section is10: 5: 4: 4: 5: 2:1; The tail hair at the end of the abdomen is obvious. Of the three bristles on each tail, 1 is extremely long, twice as long as the other two. The body length is about 1.4mm, almost black, slightly shiny, and the chest and abdomen are lighter in color. The base of the abdominal stalk segment and the first abdominal segment is yellow-brown, and the antenna and the base of the cleft lip are yellow-brown. Except for the basic segment, all other segments are dyed yellow.

The front width of the head is obviously larger than the height (22∶ 14). Individual specimens with weak ossification, even the middle eye fell into the middle plane collapse. Planting five relatively growing bristles on both sides of the inverted V-shaped notch on the surface between the two antenna nests; There are thick bristles on the edge of the semi-circular recess formed at the outer side of the labial base leaf, the end of the face and the front end of the maxilla. The inner end of the upper jaw is densely covered with white short hair, the outer part of the upper jaw is slightly concave, and the surface is densely covered with granular protrusions.

The 1 pair of bristles on the thoracic median shield is located slightly in front of the middle; The middle part of the backing sheet is slightly longer than the front part of the thoracic shield (2.5∶2). The first two thirds of the blade on both sides of the blade are a series of short longitudinal ridges, and the rear edges in the middle and on both sides are irregular and dense longitudinal ridges. The valve on the anterior thoracoabdominal segment is slightly smaller than that in women, and it is located at the length of 1/2 segment, and the distance from the anterior edge of the anterior thoracoabdominal segment is slightly larger than the valve diameter. There is a 1 depression in front of the valve. The distance between the tibiofibular joints of the front, middle and rear feet is the same as the length of the first tarsal bone.

The back of the abdomen is oval, with dense hairs on the back and abdomen, and its width and length are obviously smaller than that of the chest (width 23∶28, length 28∶36).