REVISION OF STREPSIPTERA — PIERCE. 101 



on external edge, at apical one-third abruptly bent outwards in a 

 rounded right angle, tapering to a point, the inner edge convex from 

 apex to tip of sharp process at apical third. The inner process is 

 only about one-fourth the length of the outer or apical process. 

 This type of cedeagus is unique and represented only by Stylops. 



Male. — Cephalotheca: Length 1.02 mm., breadth 1.66 mm. 

 Transverse, broadly elliptical, convex, the eyes occupying over one- 

 half the width. Face divided medianly by the broad arcuate margin 

 of the, vertex. The vertigial margin extends only two-thirds of the 

 distance from the center to each eye. Above the ends of this margin 

 and extending almost to the eyes are the large subcircular antennal 

 analogues, which are indicated by several faint concentric rings 

 and by a granular structure in the center, composed of about fifteen 

 minute granules. These analogues are less than one-fourth their 

 diameter from the eyes. Below the vertigial margin is a transverse 

 arched area bounded below by a pronounced line subparallel with 

 the vertigial margin and equal to it. This strip, which may be a 

 labral or clypeal analogue, has a punctured surface in distinction 

 from the upper part of the pharyngeal area which is distinguished 

 by a mass of close sinuate lines. The entire pharyngeal area is 

 keystone shaped, roughly divided by sculpture into two areas of 

 which the upper has just been described. It is laterally emarginate 

 for the mandibular analogues, between which it contains the open- 

 ing of the pharynx. The lower part of the pharyngeal area is of 

 the same shape as the whole area, and begins at the opening of the 

 pharynx. The mandibular analogues are sharply defined and 

 prominent, being slightly closer to the pharyngeal opening than to 

 the eyes. From these a narrow oblique strip extends to the lower 

 margin and borders the eyes. Between this strip and the pharyn- 

 geal area lies a subcircular area in the center of which is the maxil- 

 lary analogue. The latter analogues are distant from the mandibu- 

 lar by their own diameters and from each other by about three times 

 their diameter. The labial analogue is a narrow marginal strip. 



Female. — Length of cephalothorax 1.04 mm., breadth at spiracles 

 1.13 mm., breadth at base of head 0.62 mm., distance between 

 mandibles 0.15 mm. Cephalothorax light yellowish brown, margin 

 darker, especially at the front of the head, and the sides of the 

 metathorax behind the spiracles; a very dark band on the abdomen 

 sharply defines the limits of the cephalothorax. Cephalothorax 

 slightly broader than long, trapezoidal, squarely truncate at apex; 

 truncation less than one-fourth the breadth at the spiracles. Lateral 

 margin slightly constricted at base of mandibles, at base of head, a 

 little over half way from base of head to spiracles, and just before 

 the spiracles; margin from spiracles to base of cephalothorax almost 

 rectangularly bent. Mandibles obtuse with a prominent tooth at 

 84359— Bull. 66—09 8 



