114 NORTH AMERICAN DIPTERA. 



Pseiidatricliia pilosa Coq. 



The hairs of the thorax and femora are unusually long, a very 

 marked character, especially with fresh, well preserved specimens. 



Pseudatricliia flaviceps Coq. 



A well marked species, easily distinguished by the two large yel- 

 low spots on the anterior margin of the thorax, and the entire yel- 

 low front and face. The whitish line below each wing is very nar- 

 row, sometimes hardly visible. 



In looking over this species in the National Museum I discovered 

 a male, and as this sex has not been described. Dr. Coquillett kindly 

 gave me permission to do so. 



Front very narrow, as wide as the second antennal joint at its narrowest part; 

 antennae yellow, but the third joint brownish ; the yellow of the thorax less ex- 

 tended, limited to lateral humeral angles; the postalar calluses entirely yellow 

 (those of the female brownish) ; the knobs of halteres entirely white. This 

 specimen the color in general is more brownish, and the markings more whitish ; 

 the legs accordingly, so that the yellow of the knees is not so marked. Length 

 3 mm. 



One specimen from Williams, Arizona (Barber). Collection of 

 U. S. N. M. 



Psetidatrichia longurio Lw. 



Atrichia Loew, Cent , vii, 76, 1866. 

 "Male. — Black, opaque; third antennal joint dark rufous, the anterior edge 

 darker ; humeri and scutelluni yellowish or brownish ; feet and coxae brownish ; 

 but the extreme bases of coxpe and apex of tibiae and tarsi darker brown ; abdo- 

 men slender, elongated ; bypopygium dark rufous; wings grayish-hyaline, veins 

 brownish. Length 4 lin." 



Hab. — Mexico. 



EXPLANATION OF PLATE II. 



Fig. 1. Scenopinus fenestralis, wing. 

 " 2. " nabilipes, % . 



" 3. Metatrichia bulbosun, %, . 

 " 4. " " wing. 



" 5. Pseudatrichia griseola, J . 

 "6. " miicolor, % . 



" 7. " " wing. 



" 8. " " (variety), 9 . 



" 9. " '■ wing. 



CORRECTION TO PAPER I.— ORTALID^. 

 The table on page 285 (Trans., Vol. 32), at 2a, should read : 

 2a. Antennae at least six times as long as the width of the second joint; third 



joint elongated, unusually long Stictomyia Big. 



Antennae not so long ; third joint more or less oval 3 of manual. 



