20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



middle; exclusive of appendanges, almost as thick at base as long, 

 thinner anteriorly, maximum thickness about one-third thickness of 

 fully distended abdomen; flattened above and below; gular area 

 depressed. 



Frontoclypeal region {fcl, fig. i, a) well defined by distinct frontal 

 sutures {fs) ; bearing few fine punctures. Anterior part transverse, 

 extending laterally to bases of antennae; posterior portion longi- 

 tudinal, spatulate, extending backward to or almost to foramen mag- 

 num {for), truncate posteriorly. Two prominent nasal sulci {ns) 

 run obliquely backward from junction of nasale and paranasal lobes, 

 decreasing in depth posteriorly, each bearing 2 prominent setae ante- 

 riorly, designated the anterior nasosulcal setae (nsa). Other setae 

 present as indicated in figure i, a. Nasale {n, figs, i, a; 2, c) well 

 developed, unidentate, terminating sharply when uneroded ; strongly 

 sclerotized. Subnasale {sn, fig. 2, c) consisting of strongly sclerotized 

 transverse ridge, ventrally convex; serrate, when uneroded, with a 

 row of approximately 8 or 9 subequal, short, sharp, forward-project- 

 ing denticles ; most lateral denticles usually slightly larger, occasion- 

 ally projecting beyond lateral margins of nasale. Paranasal lobes 

 {pnl, fig. I, a) strongly produced anteriorly, usually extending slightly 

 beyond nasale; anterolateral corner extending farther forward than 

 rest of lobe; inner margin moderately to strongly convex; outer 

 margin straight to moderately concave ; anterior ventral margin densely 

 pilose; dorsal surface bearing 3 setae (i very small). Talus {tal, 

 fig. I, a) dark, condyle for mandible produced and strong; short 

 apodeme projecting ventrad from lateral aspect, curving slightly 

 laterad. 



Epicranial plates (epla, figs, i, a, b; 2, g) large, covering lateral, 

 posterodorsal, and posteroventral surfaces of head; infolding poste- 

 riorly to form postoccipital suture (pos) and internally producing 

 postoccipital ridge (por, fig. 4, a), which expands laterally into dark 

 irregular plates applied to inside of head capsule. Sparsely and finely 

 punctulate. Dorsally, with 2 shallow longitudinal sulci (ds), each with 

 5 setae (dsse) subequally spaced, the most anterior seta being very 

 long and sometimes farther mediad, the next less than one-half as 

 long, the 3 most posterior setae small. Ventrally with 2 strong ridges 

 (vr) and sulci (vs) running backward from region of ventral articu- 

 lations of mandibles, posteriorly forming lateral limits of postgenae; 

 each sukus bearing row of 7 to 14 setae (vsse), usually only 2 to 5 

 conspicuous. Laterally, midway between dorsal and ventral sulci, 

 with 2 pairs of long lateroepicranial setae (led, lev) arising from pits 



