360 Trans. Acad. Sci. of St. Louis. 



Sibiota n. gen. 



This genus is perhaps most closely allied to Sipalia, 

 though evidently isolated. The body is slender, with the 

 elytra abbreviated and the infra-lateral carinae of the head 

 wholly obsolete, the eyes small and anterior and the middle 

 coxae approximate. The hind tarsi are rather short, the 

 basal joint evidently longer than the second though not as 

 long as the next two combined. The type may be described 

 as follows : — 



Form slender, subparallel, moderately depressed, subalutaceous, the integ- 

 uments feebly micro-reticulate throughout, pule rufo-testaceous, the 

 abdomen black, slightly paler at tip, the legs pale, the antennae in- 

 fuscate distally; punctures very fine, moderately close-set but indis- 

 tinct, sparse on the abdomen; pubescence pale, subdecumbent, rather 

 long and distinct; head pyriform, swollen toward base with arcuate 

 sides, rather longer than wide, the neck somewhat narrow; antennae 

 extending to the middle of the elytra, gradually and moderately incras- 

 sate distally, the subapical joints transverse, the second evidently 

 longer than the third; prothorax quadrate, distinctly wider than the 

 head, very slightly wider than long, just visibly wider near apical 

 third than at base, the sides feebly arcuate, rounding anteriorly to the 

 apex, less arcuate basally, the basal angles somewhat broadly rounded, 

 the surface broadly, feebly concave along median third from base 

 nearly to the apex, the concavity gradually disappearing ; elytra equal 

 in width to the prothorax and rather less than three -fourths as long, 

 the sides somewhat diverging from the base; abdomen as wide as the 

 elytra, the sides parallel, the first three tergites narrowly and feebly 

 impressed at base; legs moderately long and slender. Length 2.35 

 mm.; width 0.5 mm. Oregon (Portland), — H. F. Wickham. 



impressnla n. sp. 



The type appears to be a female. Sibiota differs from 

 Sipalia in the obsolete infra-lateral carinae of the head, and, 

 from Typhlusida (ante, p. 263 ; — type Jlava Kr.), it differs 

 in its longer basal joint of the hind tarsi. 



Leptusa Kr. 



The genus Leptusa, like Oxypoda, is composite as organ- 

 ized at present in American literature, but the time is not yet 

 ripe to study it in detail and it must suffice for the present to 



