CHARLES W. METZ. 119 



PROSOPIS VARIFRONS Cr. 1869. 

 1869. P varifrotis, Cr. (female). Proc. Bos. Soc. Nat. Hist. 12:270. 

 1869. P. varifrotis, Cr. (male). Proc. Bos. Soc. Nat. Hist. 12:271. 

 1890. P. varifrotis, Ashm. Bull. Colo. Biol. Assn. 1 :21. 

 1895. P. varifrotis, Slosson. Ent. News. 6:5. 

 1899. P. varifrotis, Birk. Ent News. 10:244. 

 \^^\. P. varifrotis, Q.\Ci\. Psyche. 9:283. 

 1901. P. varifrotis. Lev. Ent. News. 12:9. 

 \^7,. P. varifrotis, CVW. Psyche. 10:74. 



1806. P varifrotis, Ckll. Bull. Amer. Mus. Nat Hist. 22 : 423 

 1906. P atitetmata, Ckll. Bull. Amer. Mus. Nat. Hist. 22; 423. 

 \^Wl. P. varifrotis, \.o\. Psyche. 18:184. 



Male. — Known by large, swollen scape, truncate lateral face marks, 

 with projection over antennal sockets ; black collar ; and distinct 

 genitalia. 



Length about 5-6 mm. Head normal; face rather long; scape 

 greatly swollen; clypeus short, broad ; supraclypeal area longer than 

 broad below antennal sockets, which are very close together. Meta- 

 notum very short. 



Sculpture .—YLead and thorax heavily punctured. Front, vertex and 

 occiput heavily, confluently, punctured, punctures extending some- 

 what down on to cheeks. Mesonotum closely, almost confluently punc- 

 tured, with rather small punctures ; scutellum confluently, almost rugo- 

 sely punctured ; metanotum rugulose. Bowl of enclosure of propo- 

 deum small, not clearly defined ; it and surrounding area at base rugo- 

 sely pitted, with rather small, subquadrate pits ; neck narrow, form- 

 ing a groove ; lateral areas of posterior face, and sides rugulose. 

 Mesopleura densely punctured, with medium sized, round punctures ; 

 metapleura somewhat striate, rugose. Abdomen practically impunc- 

 tate. 



Yellow Markings. — Lateral face marks stout, filling lateral areas, 

 truncate just above upper level of antennal sockets, with projection 

 following outline of socket part way along upper border ; supraclypeal 

 mark long, extending in a narrow process up between antennal sockets, 

 (fig. 85). Yellow stripe on front of scape ; spot on tubercles, front of 

 fore tibiae, base of middle and hind tibiae, and basitarsi yellow. 



Getiitalia. — Not closely resembling any other species. Armature 

 similar to that of P. tridentulus in having large cardo and heavy sti- 

 pites, with small superior lobe curving in abruptly, and rather densely 

 haired apical portion, (fig. 17). Seventh ventral plate with long, 

 pointed wings ; the basal lobe being unusually long, narrow, and hair- 

 less ; outer margin notched at a point about two-thirds of the way 

 toward apex ; with a tuft of fine hairs on the knob-like projection, and 

 a fringe of long, narrow, tooth-like processes from there to apex ; 

 membraneous flap transparent, slightly haired at tip, (fig. 41). Eighth 



TRANS. AM. KNT. SOC, XXXVII. 



