6o6 CALIFORNIA ACADEMY OF SCIENCES. 



26. Rhaphiomidas xanthos n. sp. 



San Jose del Cabo, Lower California (Eisen). One 

 male. Length, 21 mm.; of wing, over 17 mm. 



Differs from 7?. acton as follows: Abdomen entirely 

 orange -yellow, only the base of first segment and the 

 base and a median triangular cloud of second segment 

 blackish, H3'-popygium about one -fourth as long as ab- 

 domen. Macrocha;ta^ of femora mostly black, especially 

 of hind femora. 



Differs from R. episcopits (besides in above characters) 

 as follows: Bristles of posterior angles of thorax and scu- 

 tellum yellow. Abdomen shorter than wings. Segments 

 5, 6 and 7 together not longer than third. 



The hypopygium is concolorous with the abdomen, 

 orange-yellow, with a hardly darker or reddish tinge. 



The front is narrower than in the male of acton, es- 

 pecially at the vertex. In actoii ( $> ) the front is but 

 slightly widened anteriorl}^ near antennae. In xanthos 

 ( 6 ) the front widens quite evenly from vertex to base of 

 antenna, being fully twice as wide anteriorly as at vertex. 

 Antennae and legs entirely orange-yellow, with a reddish 

 tinge basally. The venter is concolorous with the abdo- 

 men, entirely orange -yellow, and the sides of abdomen 

 are without the lateral black markings (on second, third, 

 and fourth segments) of acton. The eyes seem to be 

 more of a purplish than of a greenish tinge. The cox« 

 and trochanters are of the brownish color of the pleural 

 regions. 



Palpi smaller than in acton, and apparently not so bris- 

 tly, yellowish in color. Whole abdomen, venter and hy- 

 popygium especially, clothed with silken yellowish pile, 

 rather long below but not especially thick, more so on the 

 sides and extremity. 



Since the above description was drawn up, there were 



