520 CALIFORNIA ACADEMY OF SCIENCES. 



along cubitus ; basal part of hind margin of wings with a 

 long fringe ; the costal area biareolated from near the 

 base to the pterostigma; the space behind the radius, be- 

 fore the origin of the radial sector, is also biareolated; the 

 furcation of cubitus is considerably beyond the origin of 

 the radial sector. 



Numerous specimens from San Lazaro, Sierra El 

 Taste and San Jose del Cabo, Baja California. Septem- 

 ber. Byi its biareolated costal space it is evidently re- 

 lated to B . inscriptus Hagen, but the markings are quite 

 different. 



Brachynemurus fraternus nov. sp. 



Length? i8 mm., 5 26 mm., alar expanse 35 — 40 mm. 

 This is so extremely similar in structure and in coloration 

 to the preceding species (B. calif orniciis ) that it may be 

 but a small variety of it. But the specimens were taken 

 at the same time and place, and show no intermediate 

 sizes, so I shall consider it, for the present at least, as 

 distinct. It differs from B . calif amicus, besides the size, 

 only in that the appendages of the 5 are scarcely twice the 

 length of the last segment of the abdomen ; and the mark- 

 ings on the sides of the abdomen of the 5 , and on the 

 prothorax are usually much less distinct. 



Several specimens from San Lazaro and San Jose del 

 Cabo, Baja California. September. 



Brachynemurus mexicanus nov. sp. 



Length ? 28 mm., 3 42 mm., alar expanse 55-60 mm. 

 Head yellowish, a broad black band across antennal re- 

 gion, vertex with two comma -shaped black spots, some- 

 times connected behind to the prothoracic stripes ; an- 

 tenna brown, the basal joint pale above, annulated with 

 pale; prothorax yellowish, with a dark 'brown stripe each 

 side, forked at posterior third, inner branch reaching an- 



