EXOPBOSOPA. 87 



coloration of the abdomen is different — the cross-band of the second segment is more yellowish and less 

 broad (it occupies about one third of the breadth of the segment in the middle in the male specimen 

 before me ; in E. rostrifera it is nearly one half) ; it is distinctly narrower in the middle than on the 

 sides, its posterior margin forming an arc (and not being straight as in E. rostrifera) ; there is another 

 similar whitish-yellow cross-band on the fourth segment, and some whitish scale-like hairs on the seventh 

 segment ; the other segments have a black tomentum anteriorly, and brassy-yellow scale-like hairs along 

 the posterior margins : 6, there is a slight difference in the length of the antennal style ; it is a little 

 shorter than in E. rostrifera, that is, in most specimens the style appears shorter than the third joint, 

 while in E. rostrifera it seems, in most specimens, to be longer. 

 Length 10-11*5 millim. 



Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 



I have eleven specimens of both sexes before me, but the surface of most of them 

 is abraded; I drew the description of the abdomen from two tolerably preserved 

 males. 



The shortness of the proboscis easily distinguishes this species from E. rostrifera. 

 When we examine the proboscis of E.filia from the side, we find that the little suture 

 marking the beginning of the labella is before the middle of the proboscis, as it is seen 

 projecting beyond the oral margin ; in E. rostrifera that suture is far beyond the 

 middle. 



10. Exoprosopa socia, sp. n., $ . 



Allied to E. rostrifera and E.filia, especially to the latter. The differences from both are: — 1, the conical 

 third antennal joint is but little longer than broad at its base, but the style at its end is twice as long as 

 the joint : 2, the appressed tomentum on the head, the thorax, and the abdomen is more rufous than 

 brassy-yellow ; the rufous covering on the abdomen is rather dense • the yellowish cross-band on the 

 second segment has no white or whitish in it : there are no white scales on the last abdominal segments ; 

 black erect hairs are interspersed between the rufous appressed scaly hairs on the abdomen, and form 

 inconspicuous tufts on the sides : 3, the brown of the wings has a strong admixture of yellowish-rufous, 

 especially along the costa ; the cloud on the great cross-vein is rather large, rounded ; the veins are 

 distinctly more slender than in the other two species : 4, legs rufous, the tarsi darker : 5, the proboscis 

 is longer than in E. filia, about as long as in E. rostrifera ; the face convex, but not conical. 



Length 11 millim. 



Hab. Mexico, Ciudad in Durango {Forrer). A single female. 



N.B. — This and the two preceding species may be tabulated as follows : — 



I. Style of the third antennal joint nearly as long as or longer than the joint 

 itself. 



The length of the proboscis projecting beyond the oral margin less 



than the length of the head filia. 



The length of the proboscis projecting beyond the oral margin more 



than the length of the head rostrifera. 



II. Style of the third antennal joint twice as long as the comparatively short 



joint socia. 



These three species form a natural group, differing from the typical Exoprosopce by 

 their front tibiae being beset with distinct spinules, and by the ungues of the front tarsi 



