J. CHESTKK BRADLEY. 125 



TROPAUl.A€US n. gen. 

 Head quadrate; a distinct pit below the antenuse on each side; 

 clypeus nuicron ate, separated by a suture from the face; anteunse 

 14-segmented, the last segment flattened, obtusely truncate, concave 

 above. Mesouotuni forming a part of both cephalic and dorsal 

 walls of the thorax, so that the insect appears slightly hump-backed, 

 but the medial lol)e not very gibbous ; pronotum without teeth on 

 the anterior margin. In the front wings the base of the longitudi- 

 nal sector of the free part of M is wanting, as in most Ichneumoni- 

 da% l)ut represented by a stump of a vein, the cells R -f 1st Ri and 

 M4 being thus partly united ; the free part of M3+4 separating a 

 greater distance than its own length basad of the posterior end of 

 the radio-medial cross vein ; the position of R5 indicate by a bulla, 

 and a trace of a stump where it formerly joined Mi, which is some- 

 what angled at that spot; hind wings with all veins obsolescent 

 except M and Mi+2 and R5 + Mi and R4+5H-Mi. Claws with 

 four distinct teeth beneath, and sometimes a scarcely defined fifth. 



Tropaiilacus torridus n. sp. 



9. — Brown; the antenuse except pedicel and first and last four segments of 

 tlie tlagellum, entire head except spot below ocelli, legs except the cosse, tro- 

 chanters, and middle of the femora of the posterior pair, petiole and vaginse ex- 

 cept apex yellow ; tip of mandibles, apex of the antennae and of the vaginje black. 

 Anterior half of front wings and apex deep brown, rest yellowish-hyaline except 

 the margin, somewhat smoky ; entire body clothed with short yellow pubescence. 



Head from above quadrate, the ocelli considerably forward of a line con- 

 necting the posterior margins of the compound eyes; clypeus mucronate, a deep 

 pit below each antenna ; compound eyes removed from the base of the mandibles 

 by more than the length of the pedicel ; head impunctate. weakly shining; first 

 three segments of the flagellum in the proportions of 3-4.5-4.1 ; flagellum beyond 

 the first segment covered with rows of whitish scales. Mesonotum scarcely 

 giblious, mesally emarginate, transversely rugose, the parapsidal grooves distinct, 

 scutellum with wrinkles concentric around its apex ; propodeum reticulate; poste- 

 rior coxae weakly wrinkled. Triangular spot at apex of Cui, all of M3, first and 

 second M2, M^ caudal tliird of E5 half of Ej and two-thirds of E3, yellowish 

 liyaline, the margin of M ^ and second M 2 stained somewhat smoky ; rest of front 

 wing deep brown, posterior wings yellowish hyaline, a faintly brownish mark 

 along the upper and outer border, Cu and Cuj obsolescent, transverse sector of 

 the free part of M somewhat so. Abdomen short, clavate, petiole distinct. 

 Length 10.5 mm. ; antennae 7 mm. ; front wing 9 mm. ; ovipositor 7 mm. 



One female, Brownsville, Texas, June, coll. Univ. of Kansas. 



By its peculiarly marked wings this species is very diflerent in 

 appearance from any other of our nearctic Aulaciujc, indeed, coming 

 as it does from Brownsville, in the extreme south end of the exten- 



TBANS. AM. ENT. SOC. XXXIV. APKIL. 1908. 



