— 168— 



corium, one basal, two discal, and three ante-apical. Membrane com- 

 posed of the five apical areoles. One or more additional nerves some- 

 times appear on the disk of the corium. Clavus widi two simple parallel 

 nerves terminating on the sutural margin. Wings very delicate mem- 

 branaceous ; al)dominal area large ; costa slightly concave ; supernum- 

 erary cell wanting; first radial simple ; second radial forked before the 

 apex, each of these lorks is connected by a delicate transverse nerve to 

 the adjacent railial, forming thiee apical areoles ; the two remaining 

 radials simple ; a marginal nerve running near and parallel to the outer 

 edge of the wing connects all these radials and their branches. Tarsi 

 three-jointed, tlie basal joint of die hind pair almost as long as the second 

 and third united. Abdomen .'-hort, laterally compressed, showing seven 

 segments above and six beneath ; ventral segments after the first much 

 depressed within ihe connexivum ; fifth, or ventral plate, in the male 

 sub-cylindric, slighdy emarginate at the apex ; in the female flat, ob- 

 tusely triangular and distinctly emarginate at the apex. The form of this 

 ventral plate in the female, which in Bythoscopus differs m the various 

 species and forms excellent specific characters, in Pediopsis is scarcely 

 variable and is of liltle help in discriminating the species. The characters 

 of the genitalia do not diflter materially from those of the family ; in the 

 male the valve is wanting, the plates are broad and hooked above, the 

 styles are.ligulate, curved upward toward the apex, and fringed within 

 with long hairs. 



The striation of the pronotum radiates from a central smooth line 

 obliquely towards the posterior angles. In some species these rugse are 

 very prominent, in others feeble and broken up into coalescing punct- 

 ures ; the same form of sculpture is found on the upper part of the face, 

 but here it is less distinct ; the central smooth line is generally discern- 

 able as far as the frontal suture. In the male the clypeus and lorje are 

 widened and somewhat swollen, obscuring the sutures and giving a 

 square appearance to the lower part of the face. Two styles of elytral 

 marking may be noted : unicolorous or obscurely clouded elytra, viridis, 

 lasalis and punctifrons ; transversely banded or maculated elytra, tri- 

 maculala, bifasciaia, Jlavescens, msignis and ferrugineoides ; the latter 

 form does not seem to be represented in Europe, or but feebly in cerea 

 etc. P. viridis as here defined seems to combine the characters of the 

 European group represented by virescens, and that represented by cerea, 

 glandacea, &c. , the former by the 9 viridis, the latter by the (^ ; the 

 European cerea, &c. , exhibit a black dot on the propleura and on the 

 outside of the posterior tibia at their base, the former only of which is 

 present in the American species. P. punctifrons is the only American 

 representative known to me of the spotted-faced series that is so largely 



