G. C. DAVIS. ODO 



ExolytiiN brevis n. sp. 



9. — 5 mill. Black. v\'itli mouth-parts iiicludincr clypeiis, obscure anterior or- 

 bital lines, scape, tesulse, spot before, legs and abdominal segments 2 and 3, ferru- 

 ginous; antenniB and nervuresand stigma reddish brown ; wings hyaline, areolet 

 C()mi>lete, pentangular; metathorax as in ncicidatus : abdomen with the petiole 

 polished, gradually widening toward apex, arched near spiracles and subequal in 

 length with segments 2 and 3 which, with the following, are oval and subt'oni- 

 pressed. 



Three speeimeus from Illinois, Mi<^higan and Mt. Washington, 

 N. H. (Mrs. Slosson). 



Exolytiis sericf'ifroiis n. sp. 



9 . — 8 mm. , Black, with antennse at base, mandibles, palpi, tegulge, spot before 

 and four anterior legs, yellowish white; median longitudinal stripe extending 

 from apex of petiole to apex of segment 5 and widening toward apex, rufous: 

 hind legs rufous with apex of femora, base of tibiae and their tarsi dusky : wings 

 hyaline, nervures and stigma reddish ; areolet complete, pentangular; head and 

 thorax curved vs^ith white pile, face very white; head very large, broader than 

 thorax; metathorax small, completely areolated, which makes the apical median 

 area as broad as long, areas shagreened ; petiole of abdomen polished, slightly 

 arched, not widened behind spiracles. 



Two specimens from Washington. 



Exolytiis ciillus n. sp. 



9. — 5-8 mm. Black, with median portion of abdomen more or less rufous, 

 usually segments 2-5: legs rufous, witli coxfe and trochanters black, hind tarsi 

 and base of their tibite dusky to black ; tegulse. antennae and mouth-parts black, 

 mandibles sometimes piceous; wings snbhyaline. outer nervure of areolet want- 

 ing ; metathorax as in acicnlatufi : petiole shortj polished, arched toward apex; 

 abdomen oval, compressed toward apex. 



Three females from Colorado and Illinois (Dr. Nason). 



Exolytus petiolaris n. sp. 



% .—5 mm. Black, with mandibles, palpi, legs beyond trochanters and ab- 

 dominal segments 2 and 3 rufous ; antenna? and tegulse black ; petiole very long, 

 smooth and slender; metathorax as in acicnlatiis, except that the upper part of 

 the petiolar area is glabrous; wings hyaline, outer nervure of areolet pellucid. 



One specimen from Colorado. 



E.xolytus alamagniis n. sp. 



■Jj .—5 mm. Black, with clypeus, mandibles, palpi and tegulse, yellow: scape 

 except most of posterior coxae, most of abdominal segment 3, and venter at base, 

 rufous; wings large, reddish hyaline, nervures and stigma reddish brown, outer 

 nervure of areolet wanting ; metathorax small, rugose, faintly carinateand with 

 the two median longitudinal carinse close and parallel ; petiole of abdomen long, 

 nearly straight and rugose on tergum ; entire body is finely pilose. 



One specimen from Colorado. 



Exolytus borealis n. sp. 



%. — 5 mm. Black, with paliii and tegulic yellow: scajte, mandibles and ali- 

 dominal segments 2 and 3. rufous; four anterior legs and posterior coxa' and 

 trochanters reddish yellow, remainder of hind legs fuscous, femora beneath ru- 



TRANS. AM. ENT. SOC. XXIV. UPX'EMBER, 1897. 



