388 AMERICAN HYMENOPTERA. 



Types. — University of Kansas. 



Type locality.— Thomas' Ranch, Oak Creek Canon, 6000 ft., 20 

 miles southwest of Flagstaff, in Coconino Co., Arizona. 



Collected in August by F. H. Snow. 



Two 9 iiiid three $ paratopotypes exhibit the following atypical 

 modifications: 9 > "t) blackish spot on clypeus; (?,scutel entirely 

 black ; lateral marks of second dorsal abdominal segment not free, 

 the yellow margin of the same segment not emarginate on its ante- 

 rior edge. 



In all the specimens of this species examined, there is a persistent 

 subapical, median rounded or transverse mark on the yellow portion 

 of the second dorsal al)dominal segment. 



Kiimeiies (Alpha) cruciferorum u. sp. (PI. XIII). 

 Related to emarginilineatus. 



9. Head. — As in tbe related species, with the exception of the clypeus which 

 is about as long as wide, with its anterior edge triangularly emarginate, the 

 angle of the emargination being a little greater than a right angle, shining and 

 rather coarsely but not deeply, sparsely punctured, with the middle mark united 

 to a rather circular black mark with a short petiole of black, the rest yellow ; 

 labrum brown. 



Thorax. — This portion of the insect and its appendages are essentially as in 

 emarginilineatus, barring the following points: yellow as follows — a shoit line on 

 each side of the mesonotum adjoining the posterior edge of the pronotum, a small 

 spot on each side of the scutelluni, a spot on the pleura beneath the tegulse, two 

 spots on each tagula and a '>!^-shaped mark on the anterior and lateral edge of 

 the metanotuni, i. e. the posterior aspect of the metathorox ; the anterior femora 

 are mostly yellow beneath. 



Abdomen. — Much as in the related species, the petiole more elongate, three or 

 nearly three times as long as wide at apex, shining, rather deeply and sparsely 

 punctured and with a yellow dot on each side a little beyond the middle; first 

 dorsal segment shining, its punctures about the same as those on dorsum of 

 yietiole but closer together, its lateral spots amplified to form an interrupted band 

 which unites with the apical band laterally, giving the black portion of the seg- 

 ment a sort of hour-glass appearance; apical band nonemarginate, a little more 

 than half of the second ventral segment yellow. 



'^ . — Essentially like the female; clypeus longer than wide, indistinctly punc- 

 tured, entirely yellow; labrum tipped with yellow; hook of antennae brown; 

 dorsulum, scutel and metathorax immaculate; apical band of second dorsal seg- 

 ment emarginate, its yellow lateral spots separate, free and elongated into cunei- 

 form marks; second vential segment with less than half of its surface yellow, the 

 succeeding segments excepting the apical one bunded or spotted with yellow; 

 anterior femora only tipped with yellow. 



Types. — University of Kansas. 



