BRACHYGLUTINI 195 



Integument light reddish-brown clothed in subdecumbent rufoflavous pu- 

 bescence; occipito-vertexal area very lightly punctulate, vertex anteriorly dis- 

 tinctly punctate, pronotum very lightly punctulate, elytra and abdomen more 

 distinctly punctate. 



Head with prominent eyes (0.120 x .046 mm. from a dorsal view) of about 

 36 coarse facets, the eye rounded from a dorsal view, nearly circular from a 

 lateral view with only a small triangular genal wedge incising the posterior 

 margin, occupying the area of three facets. 



Entire vertex convex save for a faint triangular flattened space between 

 and behind the vertexal foveae. Vertexal foveae each separated from an adja- 

 cent eye by the space of three facets, free with no suggestion of sulci, nude, 

 deep, a diameter slightly more than an ocular facet. Vertex not medianly cari- 

 nated. Each side of the head between eye and antenna entirely involved in a 

 large, pubescent, pyriform fovea which is not wholly visible from above. This 

 fovea appears to be a specialized homologue of the subarcuate pubescent in- 

 cision of the same area in other species of the genus {chichion, noctiphoton for 

 example), and is another argument for subgeneric isolation of euspinifrons. 

 Front produced between antennal bases into a horn (0.10 mm. long from inter- 

 antennal base to apex), extending beyond the labrum. This horn, from a dorsal 

 view, narrowing to an acute angle at apex, the apex bluntly rounded. From a 

 lateral view this horn is seen to have a wide base, arising from the middle of 

 the clypeus up to the interantennal line ; narrowing rapidly from this base ; near 

 the apex the horn is suddenly and angulately constricted so that from this lateral 

 view the apex is in two steps and sharp-pointed. The horn is provided at the apex 

 with two laterally divergent, dorsally upcurved and prominent setae. Labrum 

 tumid, with a concave distal margin. Left mandible crossed dorsal to right; 

 base of each mandible notably tumid on dorsal face. 



Antennae ten-segmented, distantly articulated. Segment I very long (as 

 long as next two united) and with the middle of the ventral face bearing a con- 

 spicuous, rounded, fiat-topped tubercle or drum-shaped tumulus; II long (as 

 long as next two united) subcylindrical; III strongly obconic; IV- VI inclusive 

 subequal, subquadrate, slightly narrower than third and much shorter; VII and 

 VIII subtrapezoidal, gradually wider than sixth; IX and X distinctly more pu- 

 bescent, the ninth larger than eighth, obtrapezoidal with a much narrower ar- 

 ticular peduncle at center of anterior face; tenth segment only slightly wider 

 than ninth, squarely truncate at base, rounded at apex. Ventral face of tenth 

 sharply and deeply incised in apical third, the basal rim of this excavation 

 densely set with a fringe of whitish setae. 



Maxillary palpi in comparison with chichion and noctiphoton conspicuously 

 swollen; four-segmented. First segment small but clearly visible; second arcuate 

 and pyriform with a rapidly expanding width to the broad apex; third trans- 

 versely triangular, outer face convex, inner face acute, this segment swollen; 

 fourth longer and wider than other segments, obliquely truncate at base, swollen, 

 the sides rapidly converging to subacute apex which bears a terminal cone. 



