202 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



petiole short ; the marginal cross-vein is inserted at the end of the first 

 vein a little before the middle of the first submarginal cell; second 

 submarginal cell but a trifle longer than the first posterior cell ; five 

 posterior cells. Coloring of the wing whitish-hyaline ; a brown spot 

 fills out the proximal end of the first basal cell ; another one, inverted 

 T-shaped, at the root of the prasfurca ; brown clouds at the proximal 

 end of the first submarginal cell, on the central cross- vein and on the 

 great cross- vein ; smaller clouds at the base of the second and third 

 posterior cells ; stigma pale brown, with a brown cloud on the marginal 

 cross- vein ; a pale cloud at the end of the seventh vein ; in most speci- 

 mens, a few brownish dots are scattered in the areas of the cells irreg- 

 ularly here and there. The size and intensity of the spots on the wings 

 vary in different specimens. 



Hab. — Orafton, near San Bernardino, Cal., in March, not rare. Two 

 males and two females. 



The forceps of the male shows the digitiform appendages peculiar to 

 the subgenus Dactylolabis (Monogr., iv, tab. iv, 26) ; a second forceps- 

 like organ, slender, horny, is visible below them. The ovipositor of the 

 female differs from that of any Tipulid I know of; the horny plate, usually 

 existing at the base of the ovipositor, is so prolonged here as to cover and 

 conceal this organ. The end of this long plate, with parallel sides, is split 

 in the middle, and produced on each side of the cleft, in a small, curved 

 point, diverging from the corresponding point on the other side. This 

 end o'f the horny plate is yellowish, the basal portion being dark brown. 

 On the under side, the plate is hollow, canaliculate, and contains, some 

 distance before its end, the small ovipositor, which is thus entirely 

 invisible from above. 



I have three more species of Limnophila, which seem peculiar to Cali- 

 fornia, but only in single specimens. For this reason, I abstain from 

 describing them. 



Phyllolabis nov. gen. 



Two submarginal cells; four posterior cells; discal cell closed; subcostal 

 cross- vein a very short distance before the tip of the auxiliary vein, which 

 is immediately before the stigma; no marginal cross-vein; first submar- 

 ginal cell about half as long as the second, its slightly arcuated petiole 

 occupying the length of the other half; the second vein and both of its 

 branches are pubescent ; the other veins are somewhat pubescent before 

 their ends ; eyes glabrous ; antenuse 16-jointed ; tibiae with exceed- 

 ingly small but distinct spurs at the tip; empodia small but distinct; 

 ungues smooth. The abdominal segment bearing the genitals is unusu- 

 ally swollen in both sexes, bearing in the male a large forceps with horny 

 appendages on the inner, and a long foliaceous whitish appendage on 

 the under side. Belongs to the Limnophilina with four posterior cells, 

 although, owing to the unusual structure of the male genitals and the 

 total absence of a marginal cross-vein, its immediate relationship to the 

 other genera of the £roup is not apparent. 



