342 



as is the entire abdomen except for the spiraciilar protuberances (PI. 

 LXXXI, Fig. 23). 



A single specimen of the pupal exuvium of this species is in the col- 

 lection here. It is unfortunately in rather poor condition, being im- 

 paled upon the pin which bears the imago. The locality is Urbana, 

 111., June 25, 1904 (Hart and Kegley). Additional Illinois localities 

 (for imagines) are as follows: Carbondale, May 30, 1904, jarred 

 from an apple tree at night (Taylor), and Odin, June 2, 1909, a large 

 series on dead twigs of elm, and one without data, June 23, 1909, 

 from same locality (Hart). 



There is a considerable difference in the color of some of the speci- 

 mens, some having the humeri and scutellum yellowish while others 

 have those parts c[uite dark, almost like disc of thorax. I am not at all 

 certain that we have as many species in North America as the listed 

 names indicate, as color, which has been exclusively used as a specific 

 separation, appears to be quite unreliable. 



Phytophagous and other Cyclorrhapha 



SYRPHID^ 



In this paper I describe the larva and puparium of one species 

 of Syrphidcc and the puparia of two others. Two of these have been 

 previously described by other writers, but very briefly. 



Metcalf has described and figured the early stages of ten species 

 of Syrphidcc from Ohio, one of which is not determined specifically*. 

 All of the named species described in his paper occur in Illinois. It 

 is opportune to notice the occurrence in this state of a parasite of Al- 

 lograpta ohliqua Say, which did not occur in connection with Metcalf's 

 work on that species in Ohio. This species belongs to the chalcid 

 genus Bothriothorax, and is at present undescribed, according to A. A. 

 Girault to whom the species was submitted. Four examples of each 

 sex of the parasite were reared by the writer from a single larva. The 

 parasites completed their metamorphoses within their host, emerging 

 through a single exit-hole in its skin. This does not coincide with 

 Hubbard's observation on the chalcid parasites of Baccha babista 

 quoted by Metcalff, which emerged through a number of holes in the 

 puparium. Metcalf reared the icheumonid Bassus hctaforius Fabri- 

 cius, from Allograpta ohliqua. The chalcid Bothriothorax pccidiaris 

 Howard, has been recorded by Smith as a parasite of syrphid puparia. 



*SyrphidgB of Ohio, Bull. 1, Ohio Biol. Siirv., published as No. 31, Vol. 17, Ohio 

 State Univ. Bull. 1913. 

 tLoc. eit., p. 51. 



