MORGAN HEBARD 59 



rounded and very weakly defined, the width at the ocelli decidedly greater 

 than between the eyes; frontal costa comparatively broad and shallowly con- 

 cave, with lateral margins rounded and very weakly defined, surface rather 

 decidedly impresso-punctate; least width distinctly greater than that of prox- 

 imal antennal joint, greatest width between antennal bases. Eyes slightly 

 longer than infra-ocular sulcus. 



Pronotum much as in caurus, the weakly convex disk curving into the 

 lobes, with the low and broadly rounded lateral carinae subobsolete; 

 disk expanding very slightly caudad, medio-longitudinal carina obsolete, 

 except very briefly cephalad on prozona and on metazona caudad of the 

 principal sulcus, continued on abdomen but very weak and obsolete on prox- 

 imal tergites. Tegmina and wings absent. 



Furcula represented by a pair of large, triangular projections, which form 

 mesad an obtuse-angulate emargination and have their external margins 

 straight, longitudinal; these processes are broader than long, but in length 

 from base of their tergite exceed one-fourth the length of the supra-anal plate. 11 

 Supra-anal plate broad, its length equal to (varying in the series to slightly 

 greater than) its basal width; lateral margins weakly convergent and very 

 weakly convex to distal portion, where on each side a very strongly obtuse- 

 angulate emargination is indicated ; (in the series at hand the apex of the plate 

 varies from sharply triangular to very strongly rounded-triangular, the emargi- 

 nation laterad varying from obsolete to strongly defined,) surface deeply con- 

 cave laterad, with a broad medio-longitudinal concavity, which is strong 

 preximad, very weak mesad and shallow distad. 12 



Cerci shorter than (varying in the series to as long as) the supra-anal plate, 

 tapering gradually from the broad base to the very slender, rounded apex. 

 Subgenital plate full, conical, free lateral margins weakly convex to the very 

 blunt apex, which is entire and is produced caudad but not elevated. Cephalic 

 and median femora moderately inflated, very feebly bowed. 



Allotype. — 9 ; same data as type, but taken June 24, 1921. 

 [Canadian National Collection.] 



Larger and more robust than male. Fastigium of vertex and front; 1 costa 

 much broader and with surface much more weakly concave, the surface of 

 the latter impresso-punctulate. Eye in length approximately that of infra- 

 ocular sulcus. Pronotum moderately broadened caudad, its convexity very 

 weakly interrupted by the subobsolete lateral carinae, which scarcely delimit 

 the disk from the lateral lobes; medio-longitudinal carina subobsolete, obso- 

 lete on the three succeeding segments, but again weakly indicated on the ab- 

 dominal tergites. Ovipositor valves much as in salur, the dorsal pair showing 

 weaker curvature than in obesa. Cephalic and median femora neither inflated 

 or bowed. 



11 Though somewhat variable in length and width, these projections are 

 seen to be constant in general contour in the very large series under consid- 

 eration. 



12 In no specimens could the type of this plate be confused with that of 

 obesa and its closer allies. 



TRANS. AM. ENT. SOC, XLVIII. 



