THE CANADIAN ENTOMOLOGIST 27 



Coelioxys clypeata Smith, variety a. 



9 . — First abdominal segment red above. The pubescence of the large 

 clypeal lobes is reddish. 



Trinidad, West Indies, June, {Aug. Busck). U. S. Nat. Museum. 



Coelioxys deplanata Cresson. 

 9 .— Tlahualilo, Mexico, July, 1905, {A. W. Morrill.) 



Ccelioxys crassula, n. sp. 



9 .- — Length about 8.5 mm.; black, robust, with the legs (except coxae and 

 trochanters) and tegulae ferruginous; mandibles black; clypeus simple, short and 

 very densely punctured; antennae black, third joint about as long as fourth; 

 eyes black or almost (not greenish or reddish) ; vertex with a smooth space on 

 each side next to eye; pubescence dull white, the abdomen with five entire 

 bands, but no short, oblique ones; mesothorax and scutellum with dense large 

 punctures, the latter with posterior margin straight; axillar spines moderate; 

 wings dusky; anterior coxae with small spines; abdomen very broad at base, 

 well punctured; apical dorsal segment keeled its whole length, ending with an 

 angle of perhaps 60 degrees; apical ventral segment broad, not much turned 

 downward at sides before end, the outer margin of the notch sharp. 



Boulder, Colorado, in D. M. Andrew's nursery, at flowers of cultivated 

 Helenium, Oct. 10, 1918. {W. P. Cockerell). In Crawford's table this runs 

 exactly to C. octodentata Say, but it differs by the entire keel on last dorsal seg- 

 ment, shorter last ventral segment, and colour of eyes. On the same flowers, 

 at the same time, were males of Melissodes seniiagilis (Ckll.). On Oct. 12, the 

 weather being unusually fine and warm for the time of year, I went to the same 

 spot in search of more C. crassula. I did not find any, but from the Helenium 

 I obtained females of Megachile brevis Say, and males of Halictus armaticeps 

 Cresson and Colletes salicicola geranii Ckll. I also collected a male Megachile 

 perihirta Ckll. Immediately adjacent was a row of Salvia pitcheri, which was 

 visited by Bonibus americanorum Fabr., Anthophora smithii Cresson, Pseudo- 

 melecta interrupia rociadensis Ckll., and Sphecodes lautipennis Ckll. 



Stelis aliena, n. sp. 

 9 . — Length about 8.5 mm. ; with the general appearance, venation and 

 pulvilli of Dianthidium (e. g., D. bicoloratum Smith), but no scopa, the ventral 

 abdominal segments with thin fringes of hair; cheeks, vertex, occiput and 

 mandibles (except teeth) bright ferruginous; two very broad black bands, 

 beginning between the ocelli, pass down the front to the clypeus, where they 

 become narrower; between these is a red band, the upper end of which (marked 

 off from the red by a constriction) is orange; between the black bands and 

 the eyes, down to the clypeus, is orange suffused with red; clypeus reddish 

 black, the lower corners red; antennae red; head very densely punctured through- 

 out, as also the thorax, the punctures of scutellum much larger than those of 

 mesothorax ; prothorax black, the tubercles with an orange spot; pleura black, 

 with thin white hair, its upper part mainly occupied by a large red patch; 

 mesothorax black in middle, laterally dull red, shading into black at 

 sides, but lateral and anterior margins yellow, except middle of anterior 

 margin, the yellow anteriorly forming triangular patches, which are extended 



