232 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



PART 1 



The lateral complement of bristles may consist of 1 

 or 2 humeral, 1 or sometimes no posthumeral, 2 noto- 

 pleural, 2 or 3 supraalar, 2 postalar and character- 

 istically a single pair of long, stout scutellar bristles. 

 Pronotal collar with a row of stout bristles, the lateral 

 propleuron with only coarse or rarely bristly pile. 

 Remaining pleuron apilose except the metapleuron 

 where there is a vertical row of 2 to 7 stout bristles and 

 sometimes supplementary pile. Sternopleuron rarely 

 with 2 or 3 hairs. Ventral metasternum with or with- 

 out scanty pile. Postmetacoxal area membranous. 

 Prosternum dissociated. 



Legs: The femora are stout without being swollen, 

 with numerous, sharp, appressed setae and with short, 

 stout bristles reduced in number. Hind femur with 

 3 or 4 lateral bristles only or sometimes merely 2 near 

 the base. Middle femur with as few as 1 anterobasal 

 and 1 anteroapical, or with a row of 10 small, anterior 

 bristles, 1 to 3 posteroapical, 1 or sometimes none 

 posteriorly at the base and often 1 or 2 bristles ven- 

 trally at the base. Anterior femur with a similar 

 complement of bristles. All of the tibial bristles are 

 stout and a little longer. The hind tibia has 4 anter- 

 odorsal and 4 posterodorsal, 4 ventromedial, and 6 

 ventrolateral bristles. Medial surface with a dense 

 brush of setae arranged in transverse rows. Middle 

 tibia with 5, and anterior tibia with 4 bristle rows, 

 each containing 4 to 8 bristles. The posteroventral 

 bristle row of both and the anterodorsal row of ante- 

 rior tibia contain the greatest number. Protibia with 

 a very short, stout protuberance and exceptionally 

 stout, robust spine. Basitarsus slightly swollen at the 

 base, with numerous, stout denticles. Claws stout, 

 arched from the base with well developed, slender 

 pulvilli and bladelike empodium. 



Wings : The marginal cell is open but reduced at the 

 apex to less than the maxium width of the cell. Fourth 

 posterior cell is closed and stalked, the vein closing 

 the fourth posterior cell and the lower end vein of the 

 discal cell tend to be nearly aligned; this leaves the 

 third posterior cell widely extended along the posterior 

 wing margin, a condition present in several related 

 genera but also in Bathypogon Loew. xllula large; 

 ambient vein complete. 



Abdomen : The abdomen is elongate, cylindroid, very 

 slightly clavate or slightly tapering. The pile is 

 greatly reduced to fine, scattered, appressed setae in- 

 cluding the lateral margin. Bristles are restricted to 

 the first tergite, where there may be from 4 to 6 stout 

 pairs. Males with eight tergites, the eighth being ex- 

 tremely short. Male terminalia rotate one-fourth or 

 more ; the epandrium is small, f idly cleft but apposed or 

 overlapping and divergent only at the apex, with the 

 proctiger extending a short distance beyond. The 

 gonopod is well developed but short and has a 

 characteristic, short slender, dorsal, toothlike process. 

 The hypandrium is prominent and large and obtuse. 

 Females with 5 pairs of stout, rounded spines upon the 



acanthophorites. The ventral plate has a charac- 

 teristic, bowl-shaped depression with concave side 

 down. 



Diogmites is a large and characteristic genus of the 

 Neai'ctic and Neotropical regions. These flies prefer 

 rather dense, rank, low growing vegetation in clamp or 

 swampy areas. They are sometimes abundant in old 

 fields and 1 or 2 species are serious enemies of hive 

 bees in the vicinity of apiaries. The eggs are deposited 

 in the earth. 



Prior to Bromley (1936) most authors treated these 

 Nearctic species under Deromyia Loew, which is a 

 distinct and separate Chilean genus. 



Distribution: Nearctic: Diogmites angustipewnis 

 Loew (1866); basalis Walker (1851); coloradensis 

 James (1933); contortus Bromley (1936); crudelis 

 Bromley 1936) ; discolor Loew (1866) ; esuriens 

 Bromley (1936) ; fragilis Bromley (1936) ; grossus 

 Bromley (1936) ; hypomelas Loew (1866) ; misellus 

 Loew (1866) ; missouriemis Bromley (1951) ; neoter- 

 nata Bromley (1931) ; perplexa Back (1909) ; platyp- 

 terus Loew (1866) ; pntchardi Bromley (1936) ; pro- 

 perans Bromley (1936) ; pulchra Back (1909) ; rufes- 

 cens Macquart (1834) ; salutans Bromley (1936) ; sym- 

 mackus Loew (1872) ; texanus Bromley (1934) ; um- 

 brinus Loew (1866). 



Neotropical : Diogmites aberrans Wiedemann (1828) 

 [ = exami?ians Walker (1851)] ; afflnis Bellardi (1861) 

 alvesi Carrera (1949); amethistinus Carrera (1953) 

 anomalus Carrera (1947); atriapex Carrera (1953) 

 bellardi Bromley (1929) ; bicolor Jaennicke (1867) 

 bifasciatus Carrera (1949) ; bigoti Bellardi (1861) 

 bilineatus Loew (1866); bimaculata Bromley (1929) 

 bromleyi Carrera (1949); brunnea Fabricius (1787) 

 castaneus Macquart (1838); coffeatus Wiedemann 

 (1819) ; craverii Bellardi (1861) ; cuantlensis Bellardi 

 (1861); dubius Bellardi (1861); duillius Walker 

 (1849) ; ferrugineus Lynch Arribalzaga (1880) [ = pla- 

 cida Wulp (1882)]; goniostigma Bellardi (1861); 

 imitator Carrera (1953) ; inclusus Walker (1851) 

 [ = parvus Carrera (1948)]; intactus Wiedemann 

 (1828) ; jalapensis Bellardi (1861) ; lindigii Schiner 

 (1S68); lineola Bromley (1934); litoralis Curran 

 (1930); maculatus Curran (1934); memnon Osten 

 Sacken (1887) ; nigripennis Macquart (1847) ; nigritar- 

 sis Macquart (1846) ; nigripes Bellardi (1861) ; notatus 

 Bigot (1878) ; obscurus Carrera (1949) ; pseudojalapen- 

 sis Bellardi (1862); reticulatus Fabricius (1805) 

 \_ = nigricauda Curran (1926)]; rubescens Bellardi 

 (1861); rufibasis Bigot (1878) [=rufitarsis Williston 

 (1891)]; rufipalpis Macquart (1838); sallei Bellardi 

 (1861); superbus Carrera (1953); tau Osten Sacken 

 (1887); ternatus Loew (1866); tricolor Bellardi 

 (1861); virescens Bellardi (1861); vulgaris Carrera 

 (1947) ; winthemi Wiedemann (1821) [ = angustiventri.s 

 Macquart (1846)] ; wygodzinshyi Carrera (1949). 



Malloch (1915, 1917) illustrates immature stages of 

 Diogmites discolor and winthemi. 



