144 Psyche [August 
Mesocheira bicolor (Fabr.). 
A female in the British Museum, labelled “Guiana,” is only 10 
mm. long. 
Isepeolus octopunctatus (JOrgensen). 
Jérgensen described this species (under Epeolus) in 1906 from 
a single female. ‘Two of the same sex are in the British Museum, 
from Patagonia (V. del Lago Blanco, Chubut). They agree with 
the original description, except that they show two more small 
white spots on the abdomen, on the hind margin of the fourth seg- 
ment. In one of the specimens these spots are barely visible. 
Jorgensen remarks that his species is allied to EL. luctuosus Spinola. 
From the particulars given by Jérgensen and IF’. Smith, I suspect 
that Isepeolus albopictus Ckll. may not be separable from J. luc- 
tuosus (Spin.), the latter being no doubt an Isepeolus. It is to be 
noted, however, that J. luctuosus was described from Chile, and was 
considerably smaller than J. albopictus; it is not unlikely that there 
are two species, one Chilian and the other in the Argentine, the lat- 
ter being really albopictus, though recorded by Jorgensen as luctu- 
osus. The genus Calospiloma Brethes, based on Epeolus viperinus 
Holmg., can hardly be separated from Isepeolus, unless the tri- 
dentate mandibles may suffice for the purpose. Brethes refers I. 
luctuosus to Calospiloma. 
