100 NORTH AMERICAN DIPTKRA. 



and truncate, but not enlarged at tip ; the two lower pair much 

 stronger tluin all the others, of which the upper pair is one and 

 one- half again longer than the next lower. All bristles and hairs 

 black. The wing as figured. 



Strauzia is the original name of this genus, which Loew called 

 Straussia, as being a more correct form. Whether good or poor 

 form, Desvoidy's name Strauzia has the priorty, and I therefore fol- 

 low Coquillett in re-establishing the original name. 



Strauzia diffusia Snow. 



One of each sex. East Las Vegas, N. Mex. 



Kpilographa obfnseata v. d.W. 



One male, Guadalajara, Mex. (McClendon). 



Agrees well with the description, excepting that the antenna 

 reaches to the lower third of face. The thorax is black, but appears 

 cinereous from the pollinose coating. The abdomen is grayish-polli- 

 nose on the middle of the dorsum and along the posterior margins 

 of the.segments, but there is a non- pollinose black spot in the mid- 

 dle of each segment, forming a median dorsal stripe. Knobs of hal- 

 teres black. The band passing over the small cross- vein is the 

 widest band on the wing, but does not meet the next band at the 

 l)Osterior margin ; and the latter band, which passes over the poste- 

 rior cross vein, is represented only by spots at the second, third, 

 fourth and fifth veins. The small cross-vein is before the middle of 

 discal cell. The basal band is not distinct below the first basal cell, 

 except as a spot at the acute apex of anal cell. 



I'lagiotoma obliqtia Say. 



Three males, Alamogordo, N. Mex. ; one male, Guadalajara, Mex. 



Only one spot on the pleura, and that at the base of the halteres. 

 The posterior part of the thoracic dorsum shining, in contrast with 

 the yellow dusted anterior portion. Apex of scutellum with a 

 brown spot. Length 4 mm. 



The male from Mexico has the thoracic dorsum entirely yellow 

 })ollinose. Scutellum without apical spot. Pleura blackened about 

 the base of halteres, and the hind coxse extending to the metanotum. 

 Abdomen with two black .spots on the lateral margins of fourth seg- 

 ment. Length 4'] mm. 



This latter seems to approach Loew's Brazilian variety referred 

 to in his Monograph, page 25L 



