APHILANTHOPS. 105 



1. Aphilanthops marginipennis. (Tab. VII. fig. 1, e .) 



Flavus, thorace flavo et fulvo maculato ; pedibus f ulvis ; alis fere hyalinis, antice fusco-fumatis, stigmate et 



costa ferrugineis ; area eordif ormis lseva. <$ . 

 Long. 11 millim. 



Hab. Mexico, Atoyac in Vera Cruz (Schumann). 



Eyes slightly diverging beneath. Ocelli almost forming a triangle, separated from 

 the eyes by more than the length of the third antennal joint, and from each other 

 by barely the length of the fourth. Clypeus at apex fringed with long fulvous 

 hair ; the middle projecting and armed with two blunt teeth. Third antennal joint 

 as long as the basal two joints united, and nearly twice the length of the fourth. 

 The punctuation of the head is moderately coarse ; much sparser on the face. The 

 orbits of the eyes behind the occiput and the back of the vertex are rufous ; the oral 

 region, face, cheeks, inner orbits to the ocelli, and a stripe between the antennae to 

 near the ocelli are yellow ; the rest of the head is black. The pile is thick and silvery- 

 white ; it is much longer on the face. Mandibles yellow and rufous, black at the apex. 

 Thorax densely covered with short silvery-white pubescence; coarsely and closely 

 punctured; the scutellum sparsely punctured ; the metanotum almost impunctate; the 

 median segment rugosely punctured ; the heart-shaped area smooth, shining, slightly 

 raised, deeply furrowed down the middle, the furrow extending to the end of the median 

 segment, the apex of which has an obliquely rounded slope. The ground-colour of the 

 thorax is black ; the pronotum above, the tubercles, the metanotum, and two elongated 

 stripes on the side of the median segment, yellow ; the scutellum, tegulse, breast, and 

 an irregular splash on the mesopleurse, rufous. Abdomen elongate-oval, a little 

 longer than the head and thorax united ; segments 2-5 furrowed at the base and in 

 the middle ; sparsely punctured, the sixth segment almost impunctate ; the basal and 

 central depressions black, the central inclining to rufous ; the rest of the abdomen 

 yellow, except the pygidial area, which is rufous ; the sides margined, slightly curved, 

 and narrowed gradually to the apex. The ventral segments black and rufous, the 

 basal segment for the greater part rufous, the others yellow at the apex. The fringe 

 of hairs on the third and fourth segments occupies the middle three-fourths ; it is pale 

 fulvous, soft, and silky, each hair being clearly separated from its neighbour and nearly 

 as long as the segments. On the fifth segment, at its junction with the sixth, in the 

 middle are two erect, stiff, comb-like, almost continuous, yellowish processes, which are 

 black or piceous-black on the top. The ventral segments are sparsely punctured, 

 furrowed at the base and apex. Legs rufous ; the hind tibiae with a black line on the 

 outer side. The cloud in the fore wing occupies the base of the median, the radial, 

 and the upper part of the cubital cellules. The first recurrent nervure is received 

 shortly before the basal third of the second cellule ; the second in the third cubital 

 cellule a little less than the length of the top of the second cubital cellule beyond the 

 second cubital nervure; the latter is curved, the first cubital nervure hardly so. 



biol. cente.-amee., Hymenopt., Vol. II., October 1890. pp 



