68 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



with a short stalk. Alula henricircular but arising 

 from the base of the vein. Middle end vein of the 

 second basal cell exceptionally long. 



Abdomen : The abdomen is short, much shorter than 

 the wings, robust, pollinose, with soft texture, and 

 short, quite scanty, fine pile; bristles absent. Sides 

 of the first tergite cloaked by the metasternum. In the 

 male are seven well developed tergites and a minute, 

 narrow, dorsal trace of the eighth. Females have 

 seven tergites, the eighth only produced and visible 

 laterally, exposing the ninth dorsally. Male termi- 

 nalia conspicuous, not rotate, the superior forceps de- 

 veloped, fully cleft, with rather long and attenuate 

 posterolateral processes, which extend well beyond the 

 distinctly short, obtuse remainder of the terminalia. 

 Hypandrium strong, large but short, convex and 

 arched, and reminiscent of certain Dioctrini, except 

 that it lies in the true ventral position. Gonopod stout 

 and convex but not longer than the hypandrium. It 

 has three pairs of long, slender processes or prongs 

 snugly tucked in beneath the proctiger. The short 

 aedeagus is undivided. The whole lower surface of 

 the terminalia is fully exposed. Female terminalia 

 short, obtuse and inconspicuous, without spines. 



In America, in the western states, the adults have 

 been taken in wheat fields. 



Distribution: Nearctic: Haplopogon bullata Brom- 

 ley (1934) ; erinus Pritchard (1941) ; lautus Coquillett 

 (1904). 



Palaearctic: Haplopogon nudus Engel (1930). 



Genus Oxynoton Janssens 



Fiqdbes 17A, 416, 846, 855, 1668 



Oxynoton Janssens, Bull. Inst. Sci. Nat. Belgique, vol. 2T, p. 1, 

 1951. Type of genus : Oxynoton francoisi Janssens, 1951, by 

 original designation. 



Related to Holcocephala Jaennicke and immediately 

 distinguished by the striking, dorsal extension of the 

 mesothorax, which is developed into a hump consider- 

 ably higher than the head and fully as long as the ver- 

 tical height of the remaining thorax. The third 

 antennal segment is attenuate, whereas in Holcoce- 

 phala it widens distally; the microsegment is not 

 plumose. Female unknown. Small species, length 5 

 to 8 m. 



Head, lateral aspect : The head is short and wide, the 

 eyes extensive, flattened anteriorly with the medial an- 

 terior facets very greatly enlarged. Face scarcely 

 visible in profile, densely micropubescent, without pile 

 except upon the lower margin. The lower pile consists 

 of a circular row of 10 or 12 long, fine, weak bristles. 

 The occiput is pubescent above and narrowly on the 

 lateral margin below, leaving a large, medial area striate 

 and bare; the pile is fine and long, but quite scanty and 

 inconspicuous. The proboscis is of medium length, 

 gently, attenuate, and bluntly rounded at the apex. 

 Palpus cylindroid, with two segments; the pile consists 

 of only a few long hairs except at the apex where there is 



an especially long tuft. The first two segments of the 

 antenna are short, nearly equal, the second considerably 

 wider apically ; both segments have long bristles below, 

 the second has a long bristle above. The third segment 

 is somewhat more narrow, but widest basally, more than 

 twice as long as the first two segments combined ; it is 

 composed of three parts, the basal part nearly two- 

 thirds the length of the whole and followed by a short, 

 minute segment to which is attached a thickened style, 

 attenuate and drawn out to a point. 



Head, anterior aspect: The face has nearly parallel 

 sides, very slightly widened below and constituting one- 

 fourth the head width. Front pubescent, without pile. 

 The ocellar tubercle has 3 or 4 soft, fine hairs. Ocelli 

 placed upon a prominent tubercular elevation with per- 

 pendicular sides, its upper level below the upper level of 

 the eye. Vertex slightly wider than the face width. 



Thorax: The mesonotum is enormously developed, 

 swollen into an obtuse, V-shaped peak with long, dense 

 pile anteromedially and more scattered pile medially, 

 posteriorly behind and laterally. Notopleuron with a 

 single fine bristle. Humerus bare. Scutellum circular 

 with impressed rim, without pile on the disc ; the mar- 

 gin has some 10 pairs of short, fine hairs. The propleu- 

 ron is united to prosternum behind. Pleuron in general 

 pubescent with a bare spot and some posterior pile on 

 the sternopleuron. Hypopleuron without pile, the lat- 

 eral metanotum beneath scutellum without pile. Meta- 

 pleuron with a vertical row of 5 or 6 long, weak bristles. 



Legs: Hind femur is slightly thickened throughout 

 its length ; ventral surface with 1 tuberculate bristle at 

 the apical third and the dorsal subapex with 1 very 

 slender, short bristle; otherwise with abundant, short, 

 fine, erect pile below and short appressed pile elsewhere. 

 Hind tibia slightly and gradually thickened towards 

 the apex, with short, scattered, subappressed pile, and 

 laterally 1 long bristle at the outer third and 1 quite 

 short bristle at the basal third ; apex with 2 lateral, 1 

 ventrolateral, 1 ventromedial, 1 medial, and 2 weaker 

 dorsal bristles. Middle femora without significant 

 bristles. Middle tibia with 5 stiff hairs posteriorly, 3 

 rather long, more conspicuous, bristly hairs anterodor- 

 sally, becoming progressively longer towards the apex. 

 Anterior femur stout, slightly arcuate, without signifi- 

 cant bristles; its tibia with short, fine pile, longer below 

 in which there are 5 or 6 slender, quite weak, bristly 

 hairs. Apex of anterior tibia without spine and with 

 2 long bristles below. First segment of anterior tar- 

 sus with 1 long bristle, Posteroventral and basal apices 

 of these tarsal segments with a circlet of 4 or 5 long 

 bristles. 



Wings: The wings are relatively short and wide, 

 marginal cell widely open; all posterior cells open. 

 Anal cell with a short stalk. Alula present. 



Abdomen: In the abdomen the tergites are only 

 slightly convex, a little wider towards the middle or 

 end of the third tergite. Seven tergites are visible, with 

 an extremely short portion of the eighth segment visible 

 on the right hand side. Male genitalia moderately con- 



