138 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



except on head. Dorsum slightly rugose, with scattered, small, shallow 

 pits. 



Head subquadrangular, with arcuate sides ; flattened above and 

 below, 



Frontoclypeal region with posterior part extending backward to 

 foramen magnum, truncate posteriorly. Two prominent anterior 

 nasosulcal setae on each side of base of nasale. Nasale (n, fig. 26, a) 

 of I well-developed tooth extending from one-half to three-fourths as 

 far forward as paranasal lobes, terminating in 3 subequal denticles, 

 lateral denticles projecting anterolaterad ; sometimes eroded to appear 

 as a single blunt tooth. Subnasale (sn) consists of many fine, sharp, 

 forward-projecting denticles on basal part of nasale; sometimes 50 

 or more such denticles, but number highly variable ; frequently much 

 eroded. Paranasal lobes produced beyond nasale, each bearing 3 or 

 more setae (only 2 prominent). 



Epicranial plates sparsely and finely punctulate. Dorsal sulci (fig. 

 26, h) each with i very long anterior seta followed by a scattered 

 group of 2 to 7 extremely minute setae (usually 4 or 5), i of which 

 is always found just laterocaudad to the large anterior hair; in pos- 

 terior part of sulcus are 3 small, subequally spaced setae. Ventral 

 sulci with row of 7 to 10 setae, usually about 4 conspicuous. Two 

 long unpaired lateroepicranial setae. Eye spot black, well defined, 

 ovate or circular; surrounded by 3 or 4 setae, only 2 conspicuous. 

 Postgenal areas expanded mesally, almost meeting, usually with i 

 minute seta centrally located. 



Gula short, narrowed posteriorly by converging postoccipital su- 

 tures, goblet-shaped, glabrous. 



Antenna with first joint weakly clavate, two-thirds to three-quarters 

 as wide as long; without setae; 2 or 3 small pores. Second segment 

 subcylindrical, two-thirds to three-quarters as wide as long; about 

 three-fifths length of basal joint; i or 2 pores; a few minute setae 

 or pegs borne distally; i medium-sized conical "sensory" appendix 

 just ventrad to base of third joint. Terminal segment small, at least 

 half as long as second joint and about one-third as wide; 4 setae and 

 some "sensory" pegs on apex. 



Mandible of moderate length, robust ; two-thirds to three-fourths 

 as wide at base (on ventral aspect) as long; retinaculum very well 

 developed, more than one-third length of distal half of mandible; 

 penicillus present, sometimes reaching base of retinaculum. Distal 

 half inward bending ; pointed ; outer surface convex with short, deep, 

 dorsal groove ; inner face slightly excavate with small median carina, 



