a. c. DAVIS. 221 



NEITRATEL.US Ratzeburg (Foerster's Synopsis;. 

 M^eiiratelilS leiK'Opsiiii Ashm. (Oythocentrus), Bull, i, Col. Biol. Assoc, 24. 



"J, . — 3 nun. Black, with lower half of head, antennse, tegulae and legs brownish 

 yellow; hind coxae and their femora blackish; wings hyaline, areolet wanting ; 

 body polished ; basal segment of abdomen with very faint granulations and lon- 

 gitudinal wrinkles; nietathorax without carime; second segment of abdomen 

 compressed from base. 



Colorado (type, coll. Ashmead). 



DELETER Foerster. 

 (Synop. der Fam. iind Gatt. der Ichn., 1868.) 



Body entirely brownish ferruginous suffii»«ciis n. sp. 



Body black. 



Petiole inflated above near base iiiidiilatiis n. sp. 



Petiole not inflated near base nor undulating obsciiruw n. sp. 



Deleter sufrii!«cus n. sp. 



%. — 2 mm. Brownish ferruginous, with antennae and legs yellowish white: 

 wings hyaline, nervures and stigma nearly transparent, areolet wanting; body 

 polished ; basal segment of abdomen longitudinally aciculate and undulating, 

 the basal segment tuberculate on basal half and with deep rounded depressions 

 behind it; carinas on metathorax prominent toward apex; abdomen not com- 

 pressed. 



One specimen from New Hampshire and labeled "A. Koebele, 

 collector." Type, coll. U. S. Nat. Mus. 



Deleter undulatiis n. sp. 



%. — 2 mm. Black, with face, scape beneath, mouth parts, tegulte and four 

 anterior legs except tarsi and posterior trochanters, yellowish white ; posterior 

 legs and all tarsi brownish yellow ; wings hyaline, nervures pale brown, stigma 

 narrow, whitish translucent; discal cell narrowed at base, so that it is subtrian- 

 gular ; antennae strong, dark brown ; metathorax transversely rugulose and with 

 lateral longitudinal carinae. becoming more distinct near the apex; first segment 

 of abdomen and base of second segment longitudiiially rugulose, rest of abdomen 

 hairy but polished, slightly compressed from apical portion of second segment; 

 second segment longer than third, first segmejit longest ; first segment depressed 

 in center at base; spiracles before middle and around these spiracles the margins 

 are greatly swollen, behind the swollen portion the margins are strongly de- 

 jiressed forming a broad, deep groove on either side and making the segment 

 appear as though divided and composed of one thick and one thin segment. 



9.— Differs in having the front above the antennae yellow and in having the 

 abdomen strongly compressed from apex of segment 2. 



Two specimens from Michigan and Illinois (Dr. Nason). Types, 

 coll. G. C. D. 



Deleter obNciiriis n. sp. 



% . — 2.ii mm. Black, with face, antennae, mouth-parts, tegulae and legs pale 

 yellowish brown ; wings hyaline, nervures and stigma darker and the latter 

 liroader than in undidatus ; third discoidal cell but little narrowed at base; meso- 

 notum and base of metanotum sparsely punctured, apex of metathorax closely 



TRANS. .\M. KNT. SOC. XXIV. AUGU.ST. 1897. 



