MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID^. 267 



1, 1, distiiict, the tarsi 5-joiiited, longer than the tibiae, the basal joint 

 of hind tarsi three times as long as the second. 



As here defined, this genus is divisible into two sections by the 

 shape otthe scutellum; in one section the seutellnm is triangular, not 

 produced into a long acute spine; in the other the scntellum is pro- 

 duced into a long acuite spine projecting far over the metanotum, and 

 it seems to comprise species that by some authors are included in the 

 genus Lcptacls. But Leptacis, as understood by me, is quite different, 

 the scntellum being produced into a short curved spine or tubercle, and, 

 as detined in this work, agrees more nearly with the genus Cerataeh 

 Thomson. 



TABLE OF SPECIES. 



FEMALES. 



Scutellum not or faintly pubescent, the apex proclnced into an acute spine 2 



Scutellura covered with a short dense pubescence, apex not iiroduced into an 

 acute spine, triangular. 



Legs l)rown, trochanters, base of tibiit, and tarsi honej'-yellow ; antennae dark 

 brown, wings with a sliort fringe. 



A. occiDEXTALis, sp. nov. 

 Legs brownish yellow; antenna^ dark brown, scape pale beneath at base; 



wings vvith a long fringe A. californicus, sp. nov. 



Legs and antenute pale yellow, the flagellum brown; wings with a short fringe; 

 petiole pale A. petiolatus, sp. nov. 



2. Spine of scutellum long, extending far ovjer the metathorax, yellow; wings with 



long ciliie. 



Legs reddish-yellow, tips of posterior femora and tibiaj brown; tibial spurs 



short; petiole black, pubescent A. americanus Aslim. 



Legs uniformly reddish-yellow or yellow; legs not especially lengthened, the 

 hind tarsi shorter than their tibiae. 

 Head highly polished; middle and posterior tibial spurs being long; the 



petiole yellow, pubescent A. minutus, sp. nov. 



Head rugulose, opaque; middle and posterior tibial spurs very short, scarcely 



developed; petiole black, pubescent A. rugiceps, sp. nov. 



Head higlily polished; femora and tibite brown or fuscous; the legs length- 

 ened, the hind tarsi longer than their tibiie ; petiole black, pubescent. 



A. LOXGIPE8 Ashm. 

 males. 



Scutellum scarcely pubescent, produced into an acute spine '/ 2 



Scutelhuu covered with a short, dense pubescence, the apex not acutely pro- 

 duced. 

 Legs pale, brownish-yellow; the flagellum dark brown. 



A. CALIFORNICUS, sp. nov. 

 2. Antenna? and legs honey-yellow or reddish-yellow. 



Club joints not much longer than wide A.minutus, sp.nov. 



Club joints live or six times longer than wide A. longipes Ashm. 



Tips of posterior femora and tibia^ fuscous; club joints about five times as long 

 as wide A. AMERICA^aTs. 



Amblyaspis occidentalis, sp. nov. 

 ?. Length, 0.8™'". Polished black, impunctured; antenufe brown- 

 black, the scape pale at base; legs brownish, trochanters, base of tibiae 



