E. T. CRESSON, JR. 113 



4. Front and face black; thorax and femora rather long, pilose. 



pilosa Coq., % . 

 Front and face yellow; thorax and femora not long, pilose; the anterior mar- 

 gin of the thorax, especially the male, yellow, in form of two large 

 spots separated by a narrow median black line. 



flaviceps Coq., 'J, , 9 • 



Pseadatrichia unicolor Coq., PI. II, figs. 6, 7. 



Of all the species of this genus, except the type Atrichia longurio 

 L\v. (which I have not seen), unicolor is so different from the others 

 that I doubt if it should be included with them under the same 

 genus. Not knowing the generic type, and as the typical descrip- 

 tion does not give sufficient structural characters, I cannot say which 

 of the two forms are typical, and therefore make no attempt to erect 

 a new genus, leaving that to the monographer, or to some one who is 

 fortunate enough to see Loew's type. 



The difference referred to is as follows : head longer than high or 

 nearly spherical ; eyes in the same proportion ; front horizontal, 

 descending only near the antennae; the thorax posesses a wart like 

 process, in a depression just above each fore coxae, which is, in this 

 species, clothed with rather long fine hairs; the abdominal segments 

 dilated at their posterior margins, appear to overlap. The form of 

 the head and abdomen especially are very noticeable. 



The female of this species has never been described, but is very 

 similar to the male, except that the front is parallel and minutely 

 rugose, not polished, except along the orbits. Both sexes have 

 upon the dorsum of the second abdominal segment two minute vel- 

 vety black spots surrounded by a polished area. These spots, I 

 notice, are present in nearly every species of this family. 



One of both sexes from Alamogordo, New Mexico (Viereck and 

 Rehn). One female from Cloudcroft, New Mexico (Viereck and 

 Rehn), PI. II, fig. 8 and 9, differs somewhat from the typical species 

 in that the iiead is longer ; the eyes likewise elongated ; antennae 

 black; abdomen proportionately longer, with its dorsum entirely 

 granular, opaque; the two spots on the second segment wanting; 

 the third section of the third vein longer than the last section. 



Pseudatrichia griseola Coq., PI. II, fig. 5. 



Two females, Alamogordo, New Mexico (Viereck and Rehn). 



A well marked species, distinguished by its general yellowish or 

 brown color. 



TEANS. AM. ENT. SOC. XXXIII. (15 ) APBIL. 1907. 



