ECONOMIC ZOOLOGY ENTOMOLOGY. 457 



with the object of recording previous work on New Orleans mosquitoes are 

 appendefl. 



Life history of syrphid fly predaceous on froghopper nymphs, P. L. Guppy 

 (D('i)t. A<jr. Trinidad and Tobago BuL, 12 (1913), No. 75, pp. J 59-167. figfi. S; 

 Dept. Agr. Trinidad and Tobago Spec. Circ. 8, 19tS, pp. 5, figs. S). — The 

 syrphid fly here dealt with, the name of which is omitted, is said to be the 

 most important enemy of the froghopper. and an attempt will be made to 

 breed it on a large scale. It has been found by dissection that the ovaries 

 contain upwards of 350 eggs and that there are 30 egg tubes in each ovary and 

 6 eggs in each tube. From 30 to 40 nymphs are killed during the life of the 

 maggot, which is from 9 to 10 days' duration, and there is no doubt but that 

 it destroys numbers of very small nymphs wherever these are abundant. The 

 egg was found to require 2A days for its development, the larva 9 to 10 days, 

 and the pupa 9 days. 



Recommendations for dealing with the froghopper, J. C. Kershaw (Dept. 

 Agr. Trinidad and Tobago Spec. Circ. 9, 1913, pp. 10). — This circular includos a 

 brief discussion of syrphus fly [Salpingogaster nigra] above noted; manner of 

 dealing with trash; use of trap lights, a summary of recommendations; and 

 miscellaneous notes. 



A new botfly from reindeer, F. Knab (Proc. Biol. Soc. Wash., 26 (1913), 

 pp. 155, 156). — Under the name CEdemagena terrwnovw the author describes a 

 second species of botfly which infests the reindeer (Rangifer terrwnovw) pe- 

 culiar to Newfoundland. This is the second species of the genus of which O. 

 tarandi, the first, was described in 1736 from Lapland. O. tarandi has fre- 

 quently been reported from northern localities of the Old World and a number 

 of times from the boreal regions of North America, including Alaska. 



The geographical distribution of the stable fly, Stomoxys calcitrans, C. T. 

 Brues (Jour. Econ. Ent., 6 {1013), No. 6, pp. 459-^77).— " The stable fly (8. 

 c(*Icitrans) is one of the most widely distributed insects, rivaling the house fly in 

 this respect. It occurs commonly in parts of every zoological region and prac- 

 tically throughout most of them. It is probably native to the palearctic region 

 from whence it has followed man in his migrations to all parts of the world. 

 In the United States it was common in the vicinity of Philadelphia as early 

 as 1776. It is not equally abundant everywhere that it occurs, but is much 

 more common in temperate regions such as the United States and Argentina. 

 In the Tropics it occurs very generally, but almost always in lesser numbers 

 than in cooler climates." 



The domestic fly (Muscina stabulans), an enemy of man and his house- 

 hold, and, in the larval stage, of the larvae of the house fly, I. A. Portchin- 

 RKY (Trudy Bmro Ent. [St. Petersb.], 10 (1913), No. 1, pp. 39, figs. 32; abs. in 

 Rev. Appl. Ent., 1 (1913), Ser. B, No. 6, pp. 108-110).— It Is stated that the 

 second stage larvae of this species attack the larvae of the house fly and very 

 soon exterminate all that happen to be living nearby. The larvae also destroy 

 the larvae of Hydrotcea dentipes, which species is also carnivorous and destroys 

 the larvae of the house fly. The larvae of Polyetes alboHneata, however, are 

 always victorious over those of M. stabulans, even when the liittor are larger. 

 Another species of the genus, M. pabnlonim, is an important enemy of the larvje 

 of Sciara militaris. The author has never observed the larvae of M. stabulans 

 eating each other, as is the case with some other larvje (P. alboHneata). 

 In his opinion the harm done by M. stabulans in destroying the Inrvae of a useful 

 fly such as H. dentipes outweighs its utility as a destroyer of the larvae of the 

 house fly. 



