138 PACKARD, HUMBLE BEES, ETC. 



number of the antennal joints, since they' could not be 

 distinctly made out with the light used ; the figure repre- 

 sents the insect when magnified 250 diameters. It will be 

 noticed that one of the {brewings is fissured, while the 

 other is undivided, but has the base of the inner edge of 

 the wing dilated into a tooth-like expansion, at a point 

 corresponding to the origin of the lower branch in the 

 other wing. I am inclined to think that the simple wing 

 is the normal form. The fact that one of the wings is 

 fissured is interesting as showing the tendency of the wings 

 of a low Hymenopterous insect to be fissured like those 

 of Pterophorus and Alucita, the lowest Lepidopterous 

 genera. In the figure I have not attempted to place the 

 wings in their natural position. It will also be noticed 

 that the right hind tibia and tarsus were wanting in the 

 specimen The species, which so far as I am aware is 

 undescribed, is dedicated to my friend Mr. Putnam, who 

 has enabled me to bring it to the notice of entomologists. 



PTERATOMUS PUTNAMII nov. sp. 



Male. Side view. Head very large, equalling the tho- 

 rax in size, but surpassing that of the abdomen; in out- 

 line sub-rhomboidal, five sided, the vertex being equal in 

 length to the under side of the head ; the greatest length 

 of the head is from the base to the obtuse point in front 

 of the eyes ; the eyes are large, globose, occupying a 

 third of the side of the head; antennae equalling in length 

 the thorax; divided into three portions, the basal thick and 

 cylindrical, the fourth joint large and much swollen, while 

 the terminal joints form a slender cylindrical tip. The 

 thorax is short and high ; the outline of the tergum is 

 very convex, especially above the insertion of the wings ; 

 the hind edge of the meso-scutum extends a little behind 

 the middle of the entire thorax, whence it descends at 

 an angle of 50 to the insertion of the abdomen ; the 

 wings are nearly twice the length of the body ; the fore- 

 wings in the single specimen are dissimilar, since one is 

 deeply fissured into two linear spatulate feather-like por- 

 tions, while the edges of the wing are fringed with long 

 nearly straight hairs ; the other primary is as large as the 

 former, but a little longer, it is entire, spatulate, dilated 



