5. ODONTOMYIA 129 



2 (1) Basal joint of the aiiteunse three or four times as long as the 

 second. 6. Stkatiomys. 



Subgenera : — 



1 (2) Flagellum ending in a broad heart-sliaped 



knob (fig. 128). Ailiocera. 



2 (!) Flagellum peg-shaped, pointed at the tip 



(fig. 125). 



3 (4) Eyes bare in both sexes. Stkatiomys. 



4 (3) Eyes hairy in at least the male. 



5 (6) Eyes banded. Hirtea. 



6 (5) Eyes not banded. Thyreodonta. 



Fig. l2S.—Alliocern graca $. 

 X 10. 



5. ODONTOMYIA. 



Odontumyia Meigen, Illig. Mag., ii., 265 (180.3). 



Rather large to rather small slightly pubescent flies of 

 blackish colour, though usually adorned with orange, yellow, 

 or greenish markings, or with the abdomen sometimes yellowish 

 green, or even pale green, witli black spots and markings.. 



Face arched, slightly retreating or perpendicular, usually strongly bulged out 

 and conspicuously pubescent ; back of the head hollowed out on the upper part : 

 proboscis rather long, with moderately long sucker-fiaps ; palpi jointed, small, and 

 cylindrical. Eyes bare or hairy, practically touching in the male and with the lower 

 facets distinctly smaller than the upper ones, but in the female separated by the 

 Inroad frons. Antennae rather long, placed at or just below the middl^ of the head ; 

 the two basal joints almost equally long (fig. 1.30) or the basal joint at the utmost 

 twice as long as the second (fig. 129); third joint elongate and with from four to 

 sis annulations of which the last two may form a terminal style, and this style 

 may have a microscopical apical arista ; antenna3 closely approximated at the base 

 and extended forward in almost one continuous divergence, at any rate after the 

 basal joint. 



Thorax broad. Scutellum with two subapical spines. 



Abdomen with five obvious segments in the male and six or even seven in the 

 female, usually scarcely broader than the thorax but sometimes much broader, 

 riattish but with a slight arch down the middle which leaves depressed flat spaces 

 Ijefore the actual sidemargins. Genitalia inconspicuous. 



Legs simple. 



Wings with the anterior veins very much crowded, so that sometimes {Hoplo- 

 doiifa) the subcostal and radial veins seem to anastomose (fig. 127); cubital vein 

 usually forked, but sometimes quite simple ; discal cell emitting three very vague 

 veinlets towards the wingmargin, of which the third and also sometimes the first 

 may be very incomplete or absolutely missing, and none of which reach the wing- 

 margin ; tlie upper brancli of the postical vein does not reach the wingmargin, and 

 the lower branch joins the anal vein a little before the wingmargin ; wing-membrane 

 bare but conspicuously ribbed. Squamae well developed ; thoracal pair bearing 

 conspicuous woolly pubescence all over. Halteres with a rather large knob. 



This genus is most allied to Stratiomys, but can always be distinguished 

 by the shorter inconspicuous basal antennal joint, the less diverging 

 antennae, and usually by the smaller size. 



Odontoviyia is a large genus of a rather heterogeneous character, but 

 no satisfactory division has been established ; the hairiness or bareness of 

 the eyes is sometimes only a sexual character, the longer basal antennal 



I 



