AMERICAN DIPTERA. 163 



and becomes red at the end of the same; it is very much obliterated 

 by a prominent black picture; this stands out as a longitudinal fascia 

 lying on the anterior side and a second on the posterior side, which 

 begins very small at the base of the femur, but soon broadens very 

 much, reaches around to the underside of the femur and there not 

 very far from the end is gradually abbreviated. The robust hind 

 tibiae are black, on the upper side red, which color extends to the 

 yellowish of the base itself, and so becomes somewhat spread out on 

 the underside; their tarsi muddy yellow, the several segments some- 

 what black on the apex. Knob of the halteres black. Wings pro- 

 portionately small, shining, with blacker, more truly-grayish obscurity, 

 and, without exception, black veins; the two submarginal cells pro- 

 portionately small and extraordinarily long, their peduncle only a 

 little longer than the sixth part of the cell itself; the second posterior 

 cell likewise very long with its base lying close to the lower half of 

 the base of the second submarginal cell; the fourth posterior cell with 

 a tolerably short peduncle; the anal cell smaller than in most other 

 species. 



Type. — M. C. Z. A single female specimen. 



Habitat. — -Texas (type); Alamorgordo, N. M. (Apr. 16, and 

 May 1, 1892). 



I have two specimens, belonging to the Am. Ent. Soc, which 

 agree almost perfectly with the above description except that 

 the occipital bristles are white and the first and second seg- 

 ments of antennae are both reddish. 



Leptogaster flavipes. 



Leptogaster flavipes Loew, Cent., II, 15, 1862. 



Leptogaster flavipes Van der Wulp, Tijdschr. v. Ent., XXVII, 



(sep.) I, male described. 

 Leptogaster favillaceus Loew, Cent., II, 12, 1S62. 

 Leptogaster flavicomis Van der Wulp, Tijdschr. v. Ent., X, 



136, 1867. 

 Leptogaster flavicomis Loew, Zeitsch, f. Ges. Naturwiss., 

 XXXVI, 120 (says probably is a synonym of flavipes). 

 c? 9- — Length 8-12.5 mm. — Small grayish species with yellow legs 

 and antennas. 



Face and mystax white; antennas yellow, the third segment ovate, 

 shorter than its black style; occiput grayish pruinose, with pale 

 bristles. Proboscis black. Dorsum cinereous, humeri yellowish; the 

 median stripe geminate, abbreviated behind; pleura? and coxae white 

 pruinose. Abdomen grayish, slightly polished, the lateral margins of 

 segments 2-4 and two incomplete bands on each, yellow. In some 

 specimens this yellow is found only as a ring about the posterior mar- 



TRANS. AM. ENT. SOC, XXXV. MAY, 1909. 



