oOO THE CANADIAN ENTOMOLOGIST. 



A. Keel on last dorsal absent Apacheorum. 



B. Keel on last dorsal extending about half the length of the segment ; 



transverse grooves on 2 and 3 entire ododentata, Sayi. 



C. Keel on last dorsal extending about three-quarters the length of the 



segment. 



a. Transverse grooves on 2 and 3 interrupted in middle 



line mcesta. 



b. Transverse grooves on 2 and 3 



entire deplanata, ribis, riifitarsis, Porterce. 



D. Keel on last dorsal extending practically the whole length of the 



segment. 



a. Transverse grooves on 2 and 3 entire grindelicE. 



b. Transverse grooves on 2 and 3 broadly interrupted 



dorsally ; mentha, Gilensis. 



Ccelioxys grifuieiice, n. sp. 



Las Vegas, at flowers of Grindelia sqiiarrosa, August 9, both sexes 

 (W. Porter); August 11, $ (S. L. Mize). 



Las Vegas, at flowers of Solidago Canadensis, August 11, (J (W. 

 Porter) ; Las Vegas Hot Springs. 



5 . Length about 11 mm.; pubescence pale with a brownish tinge, 

 that along anterior margin of mesothorax (especially at sides) and a spot 

 behind tegalte, pale ferruginous ; disc of mesothorax and scutellum 

 nude ; abdominal bands rather broad, entire and conspicuous, no short 

 lateral transverse grooves or bands, but transverse grooves crossing the 

 dorsum of segments 2 and 3 ; mandibles externally covered with 

 appressed pubescence like the face (this is also the case in ribis); 

 antennae and tegulae black ; legs black, including tarsi ; nervures and 

 stigma black ; wings with the outer margin broadly brown ; mesothorax 

 ■cancellate with extremely dense large punctures ; lateral teeth of 

 scutellum long ; abdomen rather sparsely punctured ; penultimate 

 ventral segment punctured like the others, without the minute punctures 

 interspersed ; last dorsal segment densely punctured, with a strong, 

 raised line going as far as the articulating base ; apical ventral segment 

 longer than dorsal, broad, hairy at sides, with a broad apical pointed 

 projection. 



c? . Similar to the 9 > except in the usual sexual characters ; 

 pubescence often whiter than in $ ; end of abdomen with eight teeth, 

 those on the fifth segment being well developed. 



I 



