158 NORTH AMERICAN 



widest at the middle where it is slightly narrower than long ; sides parallel 

 and feebly arcnate ; anterior and posterior angles equally and rather broadly 

 rounded ; base transverse, just visibly sinuate in the middle, apex very 

 strongly arcuate ; disk almost globular, impunctate, highly polished. Elytra 

 at base distinctly wider than the prothorax ; sides as in crussicornis ; together 

 transversely truncate behind, truncation just perceptibly sinuate near the 

 outer apical angles ; inner angles feebly rounded ; suture and scutellum 

 together distinctly longer than the prothorax ; disk very depressed, without 

 trace of punctures or reticulation, highly polished. Scutellum much broader 

 than long, rather short, strongly granulose. First five abdominal segments 

 increasing arcuately and very gradually in width, first as wide as the con- 

 tiguous elytra and rapidly constricted toward the base; segments three to 

 five almost equal in width, posterior edge of the sixth broadly sinuate dor- 

 sally ; surface depressed, polished, impunctate, not reticulate ; lateral border 

 very strong but less so than in the preceding species, abruptly much more 

 feeble on the sixth segment. Legs long ; femora robust ; tibiae distinctly 

 arcuate ; third joint of the posterior tarsi twice as long as the first two 

 together, very slender, first joint much shorter than the second. 



Mule. — Sexual characters of the same nature as in the preceding species, 

 refU'xed arcuate emargination of the sixth segment very strong and more 

 ar(;uate than in crussicornis: eighth segment less strongly impressed, laminae 

 of seventh much less convergent behind. 



fi'inale. — Unknown. 



Length 3.3 mm. 



California. 



tlasily distinguisiied from crassicorni's by its much lon<];er and more 

 slender antennae and le.ss strongly developed abdominal border; from 

 spha-ricollis it differs in the antennae, conformation of the abdominal 

 border, much blacker abdomen, size and structure of the pronotum 

 wliicli in splicer icoll Is is gradually, though very feebly narrowed 

 posteriorly. 



5. A. "brevipennis n. sp. — Form rather slender. Pubescence sparse 

 and fine, coarser and more herissate on the abdomen, testaceous. Color of 

 head, prothorax, elytra and first five segments of the abdomen rather pale 

 reddish-testaceous ; abdomen and elytra slightly darker than the head, last 

 three segments dark piceous-brown ; under surface and legs yellowish-testa- 

 ceous, except the metasternum which is darker ; antennae pale testaceous, 

 almost uniform throughout, terminal joint slightly paler than the penulti- 

 mate. Head robust, dejiressed ; eyes very small, about three times their 

 length from the posterior angles, very slightly prominent ; sides behind them 

 nearly parallel and strongly arcuate ; broadly and transversely truncate 

 behind and rather strongly sinuate in the middle; upper surface highly 

 polished and impunctate; supra-antenual tuberculations rather strong, much 

 elongated, rather strongly convergent posteriorly; between them and before 

 the middle of the disk there is a small well-marked puncture; punctures 

 at the points of origin wanting; antennae slightly shorter than the head, 



