309 



rows of 4 hairs each, thus segmentally arranged. The hyalin 

 posterior margiu of the sucker-plate profects beyond the posterior 

 edge of the abdornen. 



Ventral side. (Fig. 50). Behind the shoulders there is a hair, 

 directed outward and backward, therefore being visible when the 

 animal is viewed on its dorsal side. The sucker-plate is small 

 and contents eight distinct suckers, of which two are large, the 

 other six smaller and of equal size, standing before, on the sides, 

 and behind the two large ones. Moreover on the sides of the 

 two anterior suckers there is an indication of two other suckers. 



Legs. The tibiae 1 — 3 bear a long tactile hair. The tarsi 1 — 2 

 bear one olfactory hair, one short and two long tactile, and four 

 lancet-shaped hairs. The tarsus 3 is provided with one tactile 

 hair and four lancet-shaped hairs. The tarsus 4 has 5 hairs, of 

 which two have the dimension of about 20, two of about 75 and 

 one of about 120 p. The tarsi 1 — 3 have minute claws. 



Habitat: on Stelis phaeoptera Kirby, a bee living in the nests 

 of Osmia leiana Kirby. 



Patria: Germany. 



31. Trichotarsus Can. 



If we study the hypopi of the different species of Trichotarsus 

 yet known, we immediately observe two groups. In one of them, 

 which I will call group x, we are obliged to join the more ten- 

 der forms, with minute claws, setiform, or even minute hairs and 

 two dorsal shields. And in the other group, say group /3, I should 

 like to unite T. osmiae, xylocopae, and the others, which have 

 the same external feature, viz. an almost round body, enormous 

 claws and strong bristles. 



On examining the forms of the group x, we may separate one 

 of the species, which has many hairs, no claw on tarsus 4, and 

 a form intermediate to the other species of group cc and those 

 of the group (3. I have therefore called this species Tr. intermedius. 



On the other side, in group /3, Tr. osmiae approaches the spe- 



