226 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



Mesonotum with prominent, bare areas submedially and 

 laterally before the suture. Pile scattered, appressed, 

 setate, a double row of short, acrostical bristles and long 

 postdorsoeentral bristles present. Sides of mesonotum 

 and abdomen deep punctate; abdomen strongly convex 

 laterally and also drooping and arched. Anterior tibial 

 spur stout. Posterior tibia with similar brush of sub- 

 erect, dense pile, becoming appressed at apex. 



Paeatebpogon Paramonov, new genus 

 58. In profile only the lower face produced. From anterior 

 aspect the face is rather strongly divergent below. Front 

 pubescent, without pile or bristles. Mystax usually dense, 

 oblique, tectiform ; mystax confined to lower half or less 

 than half of face. Mesopleuron with pile. 



Aphamartania Schiner 



Whole face produced to some extent, nearly plane or very 

 slightly, scarcely concave. Front with bristles or pile or 

 both. Mesopleuron with or without pile 59 



59. Hind femur densely setate, not clavate, usually without 



bristles. Male epandrium only slightly rotate, cleft at 

 apex or divided into paired halves. Mesopleuron bare or 



pubescent, without pile 60 



Hind femur clavate, attenuate toward base, nearly bare of 

 pile, with bristles usually stout and spiny. Male epan- 

 drium long, not cleft or divided. Mesopleuron bare or 

 pubescent, with or without pile . . . Saropogon Loew 



60. Male epandrium at most cleft at apex . Saropogon Loew 

 Male epandrium completely divided, the halves widely sep- 

 arated Araiopogon Carrera 



Genus Dasypogon Meigen 

 Figures 93, 468, 1049, 1058, 1749, 1796 



Dasypogon Meigen, Mag. Insektenkunde, vol. 2, pp. 270, 55, 1803. 

 Type of genus : Asilus diadema Fabricius, 1781. Desig- 

 nated by Latreille. 1810. 



Ckcilopogon Rondani, Dipterologiae italicae prodromus, vol. 1, 

 p. 157, 1856. Type of genus: Asilus diadema Fabricius, 

 1781, as Asilus punctatus Fabricius, 1781, by original des- 

 ignation. Preoccupied, Pisces, 1841. 



Beilopogon Rondani. Dipterologiae italicae prodromus, vol. 4, 

 p. 7, 1861, emendation. 



Ohilopogon Bigot, Ann. Soc. Ent. France, ser. 5, vol. 8, p. 219, 

 1878, lapsus. 



Ceilopogon Bigot, Ann. Soc. Ent. France, ser. 5, vol. 8, p. 220, 

 1878, lapsus. 



Selidopogon Bezzi, Zeitschr. syst. Hymen, und Dipt., vol. 2, 

 p. 192, 1902. Unnecessary change of name. 



Quit© large, stout flies, characterized by the robust, 

 slightly tapered, somewhat cylindrical abdomen and the 

 well developed bristles, the prominent face and slender 

 antenna. The third antennal segment has at most 1 

 or 2 dorsal setae, and well developed microsegment and 

 apical spine. The marginal cell is open, the fourth 

 posterior cell and the anal cell are narrowly closed, the 

 former may have a short stalk. Length 25 mm. 



Head, lateral aspect : The head is rather long, chiefly 

 because of the prominent face. The eye is short, mod- 

 erately convex anteriorly and not quite plane posteri- 

 orly and without any anterior recession. The cheeks 

 are well developed and prominent. Occiput thick and 

 prominent below, especially toward the middle of the 

 head and reduced dorsally. It has thin pollen, long, 

 dense, coarse pile below, changing to slender bristles 

 in the middle which become progressively stouter above 

 and end in a deeply set, postvertical cluster of 15 on 

 each side. Proboscis long, somewhat compressed later- 

 ally, pointed at the apex, plane below with liigh, thin, 

 medial keel and a little swollen at base. The proboscis 

 has some fine, coarse hairs laterally and ventrally on 

 the basal half. The proboscis is directed downward. 

 The palpus is clearly of two segments ; the first segment 

 is hemicylindrical and excavated, partly fused, the 

 second porate, with short, conical apex and numerous 

 bristles on all sides, except medially. The antenna is 

 attached at the upper third of the head, elongate and 



comparatively slender, nearly as long as the head, or 

 perhaps quite as long; the first two segments are a 

 little more than half as long as the third with the second 

 segment longer than the first, and each bears bristles 

 above and below ; the second segment has at least 1 long, 

 stout bristle. Third segment tapered slightly at the 

 apex and carrying a short, stout, obliquely truncate 

 microsegment with apical spine; third segment some- 

 times with 1 or 2 bristles dorsally. 



Head, anterior aspect: The head is short oval, the 

 face nearly a third the width of the head, pubescent with 

 bristly hairs down the middle and with a triangular 

 patch of dense, long, stout bristles on the lower half of 

 the face. Subepistomal area large, oblique, not ex- 

 cavated and polished. The front is slightly wider than 

 the face, convergent again at the vertex. It is gently 

 excavated downward and over almost the whole and 

 laterally bears numerous bristles and bristly hairs. 

 Vertex scarcely excavated, the ocellar protuberance 

 large, low, with 5 pairs of divergent, long, rather stout 

 bristles. 



Thorax : The thorax is dully shining throughout, the 

 pollen being extremely minute and scanty. Mesonotum 

 long and rather low, somewhat more convex anteriorly, 

 with dense, short, suberect, bristly pile, which is not 

 differentiated. Thorax with the following complement 

 of long, stout bristles: pronotal collar with 10 to 12 

 pairs, upper pronotum with 4 or 5 laterally, humerus 

 with 5, posthumeral area with 5 or 6, notopleuron with 

 2, supraalar region with 4, postalar with 3, scutellum 

 with 3 pairs, and with 4 or 5 postdorsoeentral bristles. 

 The scutellum is thick and convex, a little flattened near 

 the base, without pile. Propleuron with coarse pile. 

 Other pleural pile restricted to a tiny patch in the upper 

 posterior corner of the mesopleuron. The tegula bears 

 bristles; metapleuron with a vertical band of 12 or more 

 long, stout bristles and some bristly hairs ; metanotum 

 without pile; postmetacoxal area membranous. Pro- 

 sternum completely dissociated. 



Legs : The femora and tibiae are stout, without being 

 swollen and they are densely, appressed, coarse setate 

 with long, stout bristles. Hind femur with 6 lateral 

 bristles, none at the apex. Middle femur with 3 ante- 

 rior bristles and 1 apical, posterodorsal bristle. Hind 



