THE CANADIAN ENTOMOLOGIST. 119 



Length, 12 mm. Los Angeles County, Cal. Four males and one 

 female. 



The following table contains all the species of Nicodes known to 

 occur in America north of Mexico ; of these, rufus and scitulus may 

 belong to Blacodes : — 



1. Third and fourth abdominal segments wholly black 3 



Third and fourth segments largely or wholly red . 2 



2. Body red, a black spot on the second abdominal seg- 



ment rufus, Will. 



Body black, abdominal segments three to six largely 

 red abdomina/is, Will. 



3. Wings hyaline, a brown cloud at base of each submarginal, 



posterior and of the discal cell scitu/us, Will. 



Wings marked with brown in other places than these 4 



4. Antennal style one-half as long as the third joint 5 



Antennal style only one-fourth as long as the slender third 



joint ; eastern species pictus, Lw. 



5. Fifth abdominal segment in the male more than three times as 



wide as long 6 



Fifth segment less than three times as wide as long ; California 

 species ' 7 



6. Inhabits the Atlantic States. . po/itus, Say. 



Inhabits California dives, Lw. 



7. Brown spot at tip of wing not crossing the first and second 



posterior cells ; posterior tibia? and tarsi of the male densely 



silvery within argentatus, n. sp. 



Brown spot at tip of wing crosses the first and second posterior 

 cells ; posterior tibia? and tarsi of the male not 

 silvery (emulator, Lw. 



Nicodes argentatus, n. sp., $ . Black, the tibia? and apex of the sixth 

 and sometimes of the fifth abdominal segment red. Front grayish-brown 

 pollinose, face nearly flat, white pollinose and sparse whitish pilose, 

 mystax on oral margin consisting of a few long yellowish hairs inter- 

 spersed among about fourteen stout yellow bristles ; pile of palpi and of 

 occiput white, bristles of the latter yellowish. First joint of antenna? 



