PROC. ENT. SOC. WASH., VOL. 24, NO. 4, APR., 1922 87 



the United States Bureau of Entomology at Auch, Gers, 

 (South-West France), a female Tachinid which seemed to me 

 to be practically indistinguishable from the form reared from the 

 Borer and which contained fully-developed larvae. I sent the 

 specimen to Dr. Villeneuve and he returned it with the label, 

 Paraphorocera senilis, dark variety, stating further that this 

 form had been described by Brauer and von Bergenstamm under 

 the name of Leptotachina gratiosa. The larvae obtained from 

 this female differed from those found in the caterpillars of the 

 Corn Borer but were morphologically inseparable from those of 

 the species in the Cambridge Museum collection. 



Figure 15. Paraphorocera senilis, variety "c," first stage buccopharyngeal 

 armature. This specimen was collected at Auch, while that represented 

 in figure 5 is from a Cambridge specimen. 



Thus, in the material examined there exist three types of 

 larvae corresponding to adult females all determined by the 

 same distinguished dipterologist. Of the form which appears 

 to be the typical senilis we have a large 1 series of larvae extracted 

 from a series of adult females taken at Haslar: of the form 

 reared from the Corn Borer we have numerous larvae taken from 

 caterpillars of Pyrausta nubilalis in an area extending from 

 Mont-de-Marsan (Landes) in South-Western France, through 

 Menton (Alpes Maritimes) near the Italian frontier, to the 

 region around Naples: finally, of the third form we have two 

 series of larvae, one from a female in the Cambridge collection 

 the other from a female taken at Auch. As has already been 

 stated, each of these larval forms is morphologically distinct 

 and each is represented by material sufficiently extensive to 

 prove the relative constancy of the characters distinguishing it. 

 In order to make this clear the accompanying series of drawings 

 has been prepared showing four buccal armatures of each of the 

 first two forms and two of the third. Each armature repre- 

 sented has been taken either from a separate female or from a 

 separate larva of the Borer in order to demonstrate that the 

 various forms are not simply variations characteristic of certain 



'With the exception of the Cambridge female, determined, I think, by Mr. 

 Wainwright. 



