22 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



fellow of the opposite side on the dorso-median line. This bar 

 and the genal plates form the dorsal framework of the head- 

 capsule. Prom the ventro-lateral angle of the mandible there 

 arises another long bar of chitin which runs caudad ending 

 about on a level with the median dorsal bar, very little ex- 

 panded at its tip; this bar forms the lateral framework of the 

 head-capsule. Antennce (plate I, C, b) arising on the inner 

 cephalic angle of the genal plate just dorsad of the base of the 

 mandible. It consists of a one-segmented, cylindrical, slightly 

 curved organ which bears a number of long hairs at its apex, 

 almost as long as the segment itself. Mandibles (plate I, H) 

 exceedingly powerful, decussate, ending in a long, sharp point, 

 on its caudal or inner face bearing a prominent conical tooth 

 at about mid-length, and with other blunt protuberances nearer 

 the base; one of the ventral strands of muscle has an egg- 

 shaped, chitinized piece isolated in it. Maxilla arising just ven- 

 trad of the mandibular base, articulated on its outer caudal 

 angle with the lateral chitinized bar of the head; the palpus is 

 very short, lying underneath the base of the mandible, short- 

 cylindrical, ending in a small cylindrical tip which is enclosed 

 in a rounded fleshy apex; one of the two apical lobes of the 

 maxilla (galea or lacinia) persists as a very elongate, pale, 

 blade-like organ projecting far beyond the other mouth-parts, 

 on the cephalic inner face with a long suj^porting strand of 

 chitin which is forked near the base. Mental region entirely 

 lacking strongly chitinized parts, the only indication of 

 chitinization being a pale j^ellow area continued from the tips 

 of the mandibles caudad but completely disappearing in caustic 

 potash (1% solution, 24 hours). 



Stigmal field small, oval, at the caudal end of the body, the 

 stigmata occupying the dorsal portion of the area (plate I, 

 K, L). Stigmata small, oval, placed rather obliquely, their 

 dorsal ends directed inward, the distance between them less 

 than the length of one or about equal to the small diameter of 

 one. A faint dusky mark from the dorsal margin of each 

 stigma to the edge of the field; a faint vertical stripe lying 

 between the stigmata. There are no distinct lobes around the 



