CHARLES W. METZ. 141 



that species ; differing as it does in size, proportions of face, 

 and genitalia. In its face it is intermediate between the 

 broad face of ivootoni and the very narrow one of asinhms ; 

 the lateral marks are intermediate between these two in 

 length, being longer than those of 2cootoni, but not extend- 

 ing so far along eye margin as in asininus. The base of the 

 clypeus is considerably narrower than in ivooto7ii, and the 

 lateral marks are broader above, and not irregular in out- 

 line, (fig. 111). The female can only be confused with that 

 of P. asininus or of wootoni, and in a series may intergrade 

 with the former. The specimen described is easily recog- 

 nized by its small size, and yellow markings which are not 

 large and conspicuous on either head or thorax. This and 

 the nearly related females may be separated from those of 

 the small species of the Cressoni Division by the heavy, 

 coarse punctures of the head extending on to occiput, and 

 by the heavier punctures of the thorax. 



PROSOPIS COLORADEXSIS Ckll. 1896. 

 1896. P. coloradensis (male), Ckll. Psyche Supp. 7:30. 

 1906. P. tuerlonis, (female). Ckll. Bull. Amer. Mus. Nat. Hist. 



22:423. 

 \Q07. P. coloradensis, CkW. Uni. Colo. Studies. 4:240. 



Male. — Small ; easily told by its peculiar broad face ; short lateral 

 marks and very narrow supraclypeal mark. Antennal sockets very 

 close together ; supraclypeal area below antennal sockets much longer 

 than broad. 



Length about 5.5 mm. Scape short, dark, punctured, as in asinitius. 



Sculpture. — Front, vertex, and occiput with large, confluent punc- 

 tures, becoming sparse on cheeks. Mesonotum densely punctured 

 with medium sized punctures, smaller than on head, separated by only 

 about one-half the diameter of one puncture ; scutellum similarly but 

 not so densely punctured ; metanotura rugose, almost pitted. Enclo- 

 sure of propodeum normal in shape, entire bowl pitted irregularly ; 

 lateral space on each side of enclosure pitted, as in asininus; re- 

 mainder of propodeum rugose. Mesopleura rather heavily punctured, 

 almost confluent cephalad, and becoming striate dorsad ; metapleura 

 longitudinally striate. Dorsum of first three or four segments of abdo- 

 men distinctly punctured with smaller and more sparse punctures than 

 those of mesoscutum, becoming more sparse ventrad, and almost lack- 

 ing on apical segments. 



Yellow Markings. — The face marks are clear cut, (fig. 107); lateral 



TRANS. AM. ENT. SCO. , XXXVII. (18*) 



