348 University of California PuUications. [Entomology 



3. Ocelli small, the posterior pair their owu diameter from eye-margin, 



coloration pale 4 



Ocelli large, the jjosterior pair close to eye-margin, coloration vivid 

 orange yellow A. texanus (Howard) 



4. Frontovertex about three-fourths longer than wide, the ocelli in a right 



angle, coloration chrome lemon yellow A. pallidus, n. sp. 



Frontovertex wider, about one-half longer than wide, the ocelli in 

 slightly more than a right angle, coloration pale cadmium yellow 

 A. gutierreziae Timberlake 



Males 



1. Wings hyaline throughout 2 



Wings with a smoky band across the disk A. fasciipennis, n. sp. 



2. Coloration ])a]e yellow, the abdomen usually more vivid than thorax 3 



Coloration orange yellow, the abdomen concolorous 



A. texanus (Howard) 



3. Abdomen without a dark blotch behind the vibrissae 4 



Abdomen with a conspicuous blackish brown blotch behind the vibrissae 



A. notativentris (Girault) 



4. Thorax and abdomen pale cadmium yellow A. gutierreziae Timberlake 



Thorax gamboge yellow, the abdomen more orange yellow especially at 



apex and with two dusky transverse bands across the middle 



A. pallidus, n. sp. 



Acerophagus fasciipennis, n. sp. 



FEMALE 



Frontovertex about one-half longer than wide ; the oeelli in 

 a right-angled triangle, the median one situated considerably 

 nearer the occipital margin than in A. gutierreziae, or very no- 

 ticeably behind the center of the frontovertex, the posterior pair 

 less than their own diameter from the eye-margin and about twice 

 as far removed from the occipital margin ; eyes not pubescent ; 

 antennae practically as in the other species of the group, except 

 that the scape and club are proportionately considerably shorter 

 (see table of measurements below) ; wings nearly uniformly cili- 

 ated, the speculum- extremely narrow above or practically ob- 

 literated, abruptly widening below and connecting with a branch 

 of the hairless streak on the posterior margin ; ovipositor slightly 

 longer than in A. gutierreziae, or about two-fifths the length of 

 abdomen, its sheaths pubescent. Length, exclusive of ovipositor, 

 0.75 mm. 



Coloration a little paler than in A. gutierreziae or more of a 

 clay yellow, the underparts still paler, but the abdomen decidedly 

 brighter or more orange yellow ; appendages concolorous with 



2 The term adopted here is one used by Thomson for the oblique hair- 

 less streak. 



