June, igo4.1 ViERECK AND COCKERELL : PhILANTHID.E. 87 



The second submarginal cell is petiolate (above) in the male. 



Eucerceris simulatrix, new species. 



^ . Length lo)^ mm.; black and pale yellow, with red legs. Similar in ap- 

 pearance and pattern to £. inoiitana, but smaller, with a considerably smaller head, 

 the second submarginal cell not petiolate above, but broadly joined to the marginal, 

 and the basal enclosure of metathorax strongly transversely striate, except at the tip; 

 where it is smooth and shhiing. The mandibles are ordinary, not massive as in 

 viontana. Eyes slightly diverging below ; clypeus with three little apical teeth , 

 vertex and occiput black, very densely and coarsely punctured ; this black sends 

 downwards a pair of stripes passing through the antennal sockets and ending very 

 narrowly at the clypeus, but otherwise the face is light yellow ; scape with a pale 

 yellowish stripe in front ; first three joints of flagellum ferruginous ; basal two thirds 

 of mandibles yellow ; a round yellow spot behind the upper part of each eye ; meso- 

 thorax posteriorly with widely-separated punctures on a shining ground, anteriorly 

 closely punctured ; upper border of prothorax extending to tubercles, two marks 

 (one above the other) on pleura, anterior border of scutellum narrowly interrupted in 

 the middle, postscutellum, and a large mark on each side of metathorax, all pale 

 yellow ; metathorax strongly punctured, except the enclosure, which is strongly 

 transversely striate, with a smooth apical area ; tegulae black basally, dark red out- 

 wardly, and pale yellow in front ; stigma bright ferruginous, nervures fuscous ; 

 sternites along the middle line, and coxte in front, pale yellow ; first four femora 

 largely yellow beneath, and their tibise yellow on outer side, the legs otherwise red, 

 with a black shade on the middle femora above, and a black stripe on the hind libire 

 behind, and the coxce are black behind ; abdomen with the segments strongly con- 

 stricted, strongly but not very densely punctured, black with six light yellow bands ; 

 on the venter there is some red, especially on the second segment. 



One specimen; Las Vegas, N. M., June 26, 1902 (Viereck). 



Eucerceris tricolor (Cockerell). 



Described as a variety of E. vittatifrons, but its characters persist 

 in a considerable series, and it is probably a valid species. Sometimes 

 the third abdominal segment is red as well as the second. Las Cruces, 

 N. M., Sept. 5, two (C. H. T. Townsend) ; Las Cruces, Oct. 5, 

 1895, at flowers of Giitin-rezia gloinci-ella Greene, one (Cockerell) ; 

 Highrolls, Sacramento Mts., N. M., May 30 to June 10, nine 

 (Viereck) ; Alamogordo, N. M., May 13, 1902, three (Viereck). 



Eucerceris unicornis Patton. 



The amount of red on the abdomen is quite variable. 



Las Cruces, N. M., one (C. H. T. Townsend) ; Las Vegas, N. 

 M., June 26, 1902 (Viereck). 



Also Colorado (with number 1,601) and Montana (Cresson col- 

 lection). 



