OF WASHINGTON, VOLUME XIII, lull. 



25 



Head convex above, flattened beneath, the lower lateral edge a 

 well-marked ridge made by the stretching of the skin over the pro- 

 longed basal supports of mouth-parts. Anterior part of head marked 

 off from posterior part by a band of very thin wrinkled skin; anterior 

 fold of this band beginning dorsally just in front of two large lateral 

 smooth areas containing the indefinite bluish-white eyespots; fold de- 

 scending obliquely over side of head, ending ventrally between bases of 

 maxillae. Anterior part of head and areas surrounding eye-spots with 

 glassy surface, remainder covered with thin, wrinkled skin. 



Epistoma and labrum (Ibr.) forming a thin, lance-like projection be- 

 tween upper paired parts of oral apparatus. Upper edge of labrum 



anf 



m x p 

 FIG. 2. 



grooved from opposite middle of an- 

 tennal flap (an. f. ) to base of the 

 mandibles (md.); provided with an 

 unequally two-lobed caruncle just 

 back of the upturned tip (Ibr.). 

 Higher lobe of caruncle and tip of 

 labrum each bearing a solitary an- 

 teriorly directed seta. (See fig. 2.) 

 Lower edge of labrum applied to 

 labium (/&.). Latter flat; thin lateral 

 strips diverging from a distinct ramus 

 behind being chitinized, the remain- 

 der flexible. Labium ending in a pair of rounded, conical, fleshy lips; 

 flexible portions closely set with short yellow hairs. 



Mandibles (md.) black, claw-like, blunt, sheathed at base by lobes 

 of maxillae (mx.). The latter thin, flexible, following the curve of the 

 mandibles, their slightly forward curved tips surpassing mandibles. 

 Their lower edge and inner side provided with numerous yellow hairs. 

 Palpi (mx. p.) arising from external basal flaps of maxillae. First 

 palpal joint inwardly and downwardly curved, second setiform, slightly 

 curved downward and overlapping mandible. 



Arising in the arch between epistoma and side of head is a flap 

 (an. f.) which seems to be part of theantennal apparatus. It follows 

 edge of epistoma nearly to base of mandibles, and curving down is at- 

 tached to the posterior third of first antennal joint. From this point 

 clear around the curve to where it parallels the epistoma the flap is 

 fringed with long yellow hairs. First joint of antenna (an.) slightly 

 incurved (thus being directed outward), nearly three times as long as 

 the two terminal joints together; second joint conical, tapering grad- 

 nally, directed forward and downward; third setiform and directed 

 downward. 



Anterior part of first segment very finely tesselated, the granules 

 being arranged in irregular longitudinal rows. The head retracts into 

 the posterior part of this segment, whose exterior is a longitudinally 

 striate thin membrane inflated to gibbous barrel-shape. (PL I, fig. 7.) 



