Nineteenth Annual Meeting. 131 



other male, from Washington Territory, which I believe to be of the same species, is 

 much darker, the abdominal segments dark reddish brown and black pilose, the hind 

 margins yellowish, with a fringe of light yellow pile. The pile of the body seems 

 longer, that on the dorsum of the thorax intermixed with blackish, and the black of 

 the antennse is better marked. The species is nearest allied to P. pigra 0. S. There 

 are, however, no dorsal thoracic stripes, the pollen being nearly uniform, the second 

 submarginal cell is appendiculate, etc. 



SILVIUS. 

 SiLVIUS GIGANTULUS LoeW. 



This species seems to be very common in the West. I have specimens from 

 Washington Territory, California, Colorado, and New Mexico. 



SiiiVius QUADRiviTTATUs Say, Journ. Acad. Phil, iii, 33, 1 ; Compl. Wr. ii, 54 (Chrysops) ; 

 Wiedemann. Auss. zweifl. Ins. i, 200, 9 {id.) 

 A female specimen from California agrees so well with the descriptions of this 

 species that I refer it here. The chief ground for doubt in the determination, is the 

 difference of locality, Say's specimen being from " Near the Rocky Mountains." 

 This is, however, of little moment, in consideration of the fact that so many of the 

 species of the Californian fauna reappear in Colorado. The species differs from S. 

 pollinosus Will, in being darker throughout, in the antennae being more slender, in 

 the dorsum of the thorax having gray stripes on a black ground, and in the four 

 abdominal stripes being better marked. 



SiLvius POLLINOSUS WillistoH, Trans. Connecticut Acad, iv, 244 — Western Kansas. 



Additional specimens of this species differ from the types in their much larger 

 . size (11-12 mm.) The wings have a whitish appearance and light-colored veins, the 

 small clouds on the cross-veins darker and more conspicuous, with none on the 

 course of the veins themselves. I hardly think it probable that this is the Chrysojis 

 quadrivittatus of Say and Wiedemann, since there are no blackish stripes on the 

 dorsum of the thorax. As regards the generic location of both this and the pre- 

 ceding species, there may be a question. The structure is quite like that of tS. gigan- 

 tulus, but the general appearance is very different. The eyes, as revived over wet 

 sand, show the characteristic markings of Sihius, that is. numerous irregularly scat- 

 tered black dots over a green background. The species must resemble those of the 

 European Nemorius Rondani, and may perhaps belong there. The third joint of 

 the antennje, however, is considerably longer than the first two together. 



APATOLESTES. 

 Williston, Entom. Americana, i, 12, 1885. 

 Apatolestes comastes Williston, 1. c. — California. 



CHRYSOPS. 



SUPPLEMENTARY TABLE OF SPECIES. 



1. Cross-band obsolescent; abdomen black nigbibimbo Whitney. 



Cross-band distinct 2 



2. Apex of wing beyond cross-band hyaline 3 



Costal margin beyond cross-band more or less infuscated 4 



3. Second basal cell infuscated on extreme basal part; abdominal segments with 



posterior gray borders soedidus 0. S. 



Second basal cell largely infuscated; abdominal segments without posterior gray 

 borders cuclux Whitney. 



