1914;.J NATURAL SCIENCES OF PHILADELPHIA, 47 



divisions. The anterior portion has a central arm extending half- 

 way to the upper edge of the first abdominal segment, whicii branches 

 into two wing-lik(^ i:)rojections at right angles to the central arm and 

 extending transv(n'sely across the abdomen on either side of the 

 median line. The outer ends of these projections are often slightly 

 enlarged. Forbes and Schmeil both find that these side arms are 

 "S-shaped." Among all the specimens that I have examined from 

 this locality, I have noted the "S shape" in only one instance. In 

 many cases the outer ends of the wing-forms tend to turn up slightly, 

 but the "S-shaped" canals are certainly the exception and not the 

 rule among the local representatives of this species. Consequently, 

 in my drawing (PI. Ill, fig. 5) I have shown what I consider a rather 

 more characteristic form of the receptaculum seminis for C. prasinns. 

 This somewhat insignificant detail shows that the receptaculum 

 seminis may be a variable character. 



The portion of the receptaculum behind the suture consists of two 

 lateral sacs connected by a narrow transverse canal lying close under 

 the suture. In the middle of the anterior edge of this lower con- 

 necting arm is the porus. The anterior division of the receptaculum 

 fuses with the posterior at this same point. 



The contents of the upper and lower portions differ in appearance 

 only. Dr. Schmeil has proved that the spermatozoa in the upper 

 portion are simply more densely packed together than in the lower. 



The egg-sacs contain only a few ova. I have never noted more 

 than ten; seven is an average number. They adhere closely to the . 

 abdomen, often covering two-thirds of its dorsal area. 



An average length for the female from this locality is .82 mm. 

 Forbes gives .48-.7 mm. Some of the European measurements 

 are as follows: 



Vosseler 1.0 mm. 



Richard 9 mm. (after Schmeil). 



Vernet 88 mm. 



Schmeil 8-.9 mm. 



The males average .62 mm. long and .14 wide. They have a very 

 long setae at the distal end of the first division of the first antennae. 



The color seems to be quite constant. The first thoracic segment 

 is a pale yellowish-brown with irregular patches of blue-green along 

 its posterior border. The remaining thoracic segments are a deep 

 shade of blue-green. The first abdominal segment is brown, more 

 dense in the anterior half. The remaining segments are irregularly 

 blotched with the thoracic shade of green which becomes solid in 



