F. R. COLE / 



The abdomen is usually globose or ])alloori-shapo(l, appearing 

 swollen, and there are usually five segments. The al^domen in 

 Eulonchus is longer and not so distended, and in some foreign 

 genera, such as Thyllia, the shape is quite different. The pubes- 

 cence may be thick or sparse. The female genitalia are most 

 conspicuous in Acrocera, and the male genitalia are easily made 

 out in Ogcodes. Male specimens of l^ulonchus tristis and E. 

 mpphirhius taken l)y the writer during the breeding season 

 had the male genitalia protruding, and in some specimens quite 

 prominent. 



The legs are of medium length and strength and there are no 

 spines or bristles, although there are often tibial spurs; these are 

 really sharp projections of the tips of the tibiae, however, and are 

 quite short. The empodia are developed pulvilliform and pad- 

 like; the claws and pul villi are well developed and there appears 

 to be no sticky secretion on the pads, which enables most flies to 

 cling to a smooth surface. 



When at rest the wings are defiexed and lie against the ab- 

 domen roof-like. The wings are longer and usually broader in 

 the female than in the male. The venation is often puzzling 

 and difficult of interpretation, and to add to the difficulty the veins 

 are often weak. The costal vein may not reach the wing-tip or 

 it may continue all the way around the margin. The praefurca 

 starts about opposite the discal cell, and the discal cross-vein 

 (absent in some) is placed close to the praefurca and near the 

 base of the discal cell. Another cross-vein often occurs near the 

 end of the discal cell, causing a supernumerary cell. Osten 

 Sacken considered this outer division a posterior cell and not an 

 outer part of the first basal cell, which Verrall thought it to be; 

 I am inclined to adopt Verrall's viewpoint. These veins may be 

 obsolete in some and the number of posterior cells reduced. 

 The second longitudinal vein may be absent. The branch of 

 the third longitudinal may be long and normal, including the 

 wing-tip, or both branches may curve up and run parallel to the 

 margin before the wing-tip. In Acrocera there is a wide open, 

 spurious, third longitudinal fork, and the lower branch, is, I 

 believe, a part of the fourth vein. There is a spurious cross-vein 

 which is really the upper branch of the fifth longitudinal fork. 

 The wing membrane is usually bare and in most species rippled. 



TRANS. AM. ENT. SOC, XLV. 



