24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



Subnasal flap is strengthened by two irregular "epipharyngeal rods" 

 (ephr) with anterior margins drawn out into long setalike filaments 

 (fil), some branching. Two small brown "sensory"' plates (spla, 

 fig. 4, e, /) lie directly caudad to sinuousities between nasale and 

 paranasal lobes, posteriorly covered by membrane, anteriorly with 

 5 or 6 circular "sensilla." Remainder of dorsal lining covered by 

 minute, pointed "sensilla" (sen) (base of each sensillum not articu- 

 lated but continuous with membrane from which it arises), increasing 

 anteriorly in density and in length, becoming setalike at anterior 

 margin of subnasal flap. Ventral surface of preoral cavity well 

 supplied with sensilla and branching filaments arising from dorsal 

 aspect of labium and maxillae. Opening of mouth small, transverse, 

 above base of hypopharynx; screened by sensilla and filaments of 

 subnasal flap, hypopharynx, laciniae, prementum, and by penicilli of 

 mandibles. 



Tentorium {t, fig. 4, a; fig. 4, h) consisting of well-developed, 

 unconnected posterior arms {pt) extending both forward and back- 

 ward from region dorsad to posterior tentorial pits ; posterior part of 

 each arm produced straight backward to near base of head ; anterior 

 part ending freely in head cavity near posterolateral corner of 

 hypopharyngeal sclerome. Short apodeme produced ventrally from 

 lateral aspect of talus might represent vestigial anterior tentorial arm, 

 being somewhat similar in position to structures in carabid larvae 

 labeled by Boving (1910, p. 365, fig. 2, T) as "tentorium." 



Ccrmcal sclerites (cv, figs, i, a; 2, g). Usually 2 subovate or sub- 

 rectangular pale, indistinct sclerites dorsally at base of head, i on each 

 side of middorsal line. Sometimes other indefinite, variable, and 

 weakly sclerotized areas found farther caudad or laterad. One small 

 stout seta on cervical membrane directly behind each dorsal epi- 

 cranial sulcus {ds). 



Thorax (fig. 5, a, b). Prothorax slightly more than three-fourths 

 combined length of mesothorax and metathorax. All segments 

 broader than long, each slightly wider and thicker than preceding 

 segment. 



Prothorax (/) wider posteriorly; slightly wider than long. Ter- 

 gites (tg) not divided into medial and lateral sclerites as in meso- 

 thorax and metathorax; with anterior and posterior margins mem- 

 branous and longitudinally striate ; with scattered small shallow pits ; 

 without well-defined impressions; anteriorly with 7 to 10 setae (on 

 each side of middorsal suture) arranged in transverse row, mostly 

 in pairs ; posteriorly with 5 to 8 setae in transverse row, usually ar- 



