192 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



3. Bibiocephala comstocki, sp. nov. 



Plate XVIII, Figs. 6 and 7; Plate XIX, Fig. 6; Plate XX, Figs. 

 5 and 6; Plate XXI, Fig. 4. 



Eyes (PI. XVIII, figs. 6 and 7) of both male and female separated by a 

 narrow space, and bisected by a narrow unfacetted stripe; upper, large- 

 facetted portion of each eye larger in proportion to rest of eye in female 

 than in male, antennce twice as long as head or a little more, 14-segmented, 

 the two basal segments annulated with white; hind legs longer than the 

 subequal middle and fore legs, the hind tibiae with spurs, other tibiae without 

 spurs, the ungues strong and with the basal half bearing numerous short, 

 fine hairs; wings (PI. XIX, fig. 6) with a cross-vein between media and 

 cubitus (cross-vein connecting veins four and five) and with R.^ distinct 

 for a short distance but running into Rx about one-third of the distance 

 from the origin of R-i, to the tip R^ (second vein with a short anterior branch 

 which begins proximad of the origin of the third vein, and which runs into 

 the first vein about one-third of the distance from the origin of the second 

 vein to the tip of the first vein); a faintly indicated subcostal vein (auxiliary) 

 is apparent, which extends about half the length of the costal margin; body 

 covered with fine blackish pile. 



Length, male 7.5-8.5 mm.; female 9-10 mm. 



Described from one free-flying male, Campbell Creek, 

 near Congress Springs, Santa Clara County, California, 

 April 6, 1900, and from numerous males and females 

 dissected out of pupal cases taken from Los Gatos, Corte de 

 Madera, Stevens, Alembique, Los Trancos, and Campbell 

 creeks, and from Bear Gulch, from March to May, 1900 

 and 1901 — all these streams being in the Santa Morena and 

 Santa Cruz mountains, within twenty miles of Stanford 

 University, California. Named for Professor J. H. 

 Comstock. 



Immature Stages. The larvae ( PI. XX, figs. 5 and 6) when full grown 

 measure from 9 to 12 mm. in length; dorsal surface of the body pale ground- 

 color, with a broad, transverse darkish bar, usually indistinctly outlined on 

 each body segment; near the middle of each segment a pair of small black 

 spots always present, though sometimes rather faint; lateral processes double, 

 not very long, the anterior one of each pair being the longer and slenderer, and 

 blackish all over, the posterior one being dark brown below and whitish 

 above; the ventral suckers unusually small, the antennae unusually long; the 

 tufts of tracheal gills consisting of four tubules each. 



The pupce ( PI. XXI, fig. 4) are from 7 to 8 mm. long, black (not dark 

 brown) and with short, broad, prothoracic respiratory plates, the two groups 

 of plates being set more closely together than usual with Blepharocerid pupae. 



