THE CANADIAN ENTOMOLOGIST 11 



Head. — Clothed with long grayish while pubescence; no dark hairs on 

 vertex. Punctures on clypeus much closer than in female. Labrum very large, 

 closely punctured, its apical margin incrassate, smooth and shining, clothed with 

 a few yellowish hairs. Antenna short; second joint of flagellum longer than 

 third and fourth united; last joint a little compressed. 



Thorax. — ^Entirely covered with dirty white pubescence, even the sternum, 

 only on scutellum the hairs are brownish. Propodeum w^ith longer and denser 

 hairs as in female, the basal area concealed under the long pubescence. 



Abdomen. — As in female, but the hairs on sides and apical margins much 

 shorter, hence the fascia narrower and weaker, especially when seen from 

 behind; fifth and sixth segments with orange- yellow fascia?, and undefinited 

 patches at sides basally formed by fuscous hairs; seventh segment with dense 

 fuscous hairs. 



Wings. — The origin of the cubital nervure a trifle nearer to base of wing 

 than that of first recurrent nervure; this entering second cubital cell between 

 middle and apex, closer to its middle. 



Legs. — Stouter than in female, less hairy, the hairs pale. Hind coxa? very 

 thick, almost without punctures, but clothed with fine, long, yellow'ish hairs. 

 Claws with the median tooth longer than in female, almost reaching tip of 

 claws. 



Argentina; Santa Fe. 



Female. — (Type) Dec. 30, 1910, on Opiintia monacantha Haw^ 



Male. — (Genotype). Same locality, without other date. 



From Teleutemnesta s. Emphor fructifer (only the female is described by 

 Holmberg) it differs by the mandibles not spotted with yellow; by the pubes- 

 cence of thorax which is gray mixed with a few fuscous hairs in fructifer. The 

 punctures on thorax of opuntice are neither very fine nor very close as in Holm- 

 berg's species. The scopa is fuscous in opuntice, fulvous in fructifer; the latter 

 has the four basal segments of abdomen fringed with orange-yellow fasciae. 



The males described by Vachal as fructifer are perhaps another species 

 as they are unusually small (10-11 mm.), while in the other known species the 

 male is equal in size to female or even larger. From these so-called fructifer 

 the new species differs by the tubercles being clothed with pale hairs as well as 

 the anterior pair of legs and the femora of the remaining. All these are clothed 

 with black hairs in Vachal's specimens. 



E. tricolor (Friese) female has no transverse fascia? of dark hairs on meso- 

 notum and scutellum, but many gray hairs which replace sometimes all the 

 black pubescence; the abdominal segments 2 and 3 have whitish fasciae, and only 

 the sides of third and fourth segments have yellowish fasciae. Moreover, it is 

 smaller (12 mm. long, 4 mm. late), against 13 and 4,5 mm. in opuntice. 



The male of E. tricolor is smaller and has yellowish hairs only at sides of 

 abdominal segments 3 and 4. The description given by Friese is very incom- 

 plete and not fit for comparison. 



E. bifax Vach., judging from the very short description, is quite another 

 insect. 



Ptilothrix megasoma Brethes seems to belong to Emphor too; it is a large 

 bee (15 mm.) from Mendoza, and differs considerably from opuntice. 



