190 ASHMEAD 



Genus Microcryptus Thomson. 



TABLE OF SPECIES. 



Black ; all coxae black. 



Legs ferruginous ; abdomen black, with the apices of dorsal segments 2, 

 3 and 4 ferruginous. Male M. trifasciatus. 



Legs black and ferruginous ; scape beneath, anterior and middle coxae 

 at apex and trochanters pale yellowish ; abdomen black with the 

 second dorsal segment at apex narrowly, the whole of the third and 

 the middle of the fourth dorsal segments ferruginous. ..M. alaskensis. 



MICROCRYPTUS TRIFASCIATUS sp. nov. 



Male. Length 5.4 mm. Black, coriaceous; palpi fuscous; epi- 

 tegulas yellowish-white ; legs, except coxa and first joint of trochanters 

 and apical margins of dorsal abdominal segments 2, 3 and 4, the latter 

 very narrowly, ferruginous ; the coxas, first joint of the trochanter and 

 abdomen black. Wings hyaline, the stigma and veins brown, the 

 areolet pentagonal, receiving the recurrent nervure very slightly beyond 

 the middle, the submedian cell a little longer than the median. 



Type. Cat. No. 5595, U. S. Nat. Museum. From St. Paul Island, 

 August 1 6 (Fur Seal Commission). 



MICROCRYPTUS ALASKENSIS sp. nov. 



Male. Length 4.6 mm. Black ; scape beneath, palpi, tegulae, epi- 

 tegulse, apices of front and middle coxa?, their trochanters and the 

 tibial spurs ivory or yellowish-white; rest of legs, except as noted, 

 ferruginous, the front and middle coxae black or fuscous, the hind legs 

 mostly black, with the second joint of trochanters and the tibiae basally 

 ferruginous ; mandibles and the extreme apex of dorsal abdominal seg- 

 ment 2, the whole of 3 and most of 4, rufous. Wings hyaline, the 

 stigma and veins brown. Metathorax completely areolated. Abdo- 

 men, except the petiole which is aciculate and the second segment 

 which is feebly shagreened, smooth and shining. 



Type. Cat. No. 5575, U. S. Nat. Museum. From Sitka, June 16. 

 One specimen. 



Genus Plesiognathus Forster. 



PLESIOGNATHUS RUBROCINCTUS sp. nov. 



Male. Length 4 mm. Polished black, the face finely punctate and 

 clothed with a sericeous pile ; mandibles and legs, except coxse, first 

 joint of trochanters, front and middle femora basally, hind femora at 



