402 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 5 



on the State Fair grounds this month to be used in the kitchen. It 

 was found that waste, stale meat thrown into a box was more attrac- 

 tive to the flies than bread and milk in the trap. This was overcome 

 by putting small pieces of the stale meat in the pans with the bread 

 and milk and the receptacle of the trajD was soon swarming with 

 thousands of flies. ' 



The flies, which gather in the upper part or receptacle, should be 

 killed by immersing that part of the trap in hot water or pouring boil- 

 ing water over it, or in any other way not injurious to the trap. The 

 dead flies may be emptied out of the trap, the bait renewed and the 

 trap reset. 



We have been so pleased with the success of this contrivance that 

 we have proposed for it the name which is used at the head of this 

 article. 



ARTHROCNODAX OCCIDENTALIS N. SP. (DIPT.) 



By E. p. Felt, Albany, N. Y. 



The small, yellowish species described below and easily separated 

 from other American forms by the emarginate ventral plate, was 

 reared July 15 and 30, 1912, by H. J. Quayle of the Division of 

 Entomology, University of California, Berkeley, from larvse preying 

 on red spiders, Tetranychus species. 



Male. Length 1 mm. Antennae a little longer than the body, thickly haired, 

 pale straw, yellowish basaUy; 14 segments, the fifth having the stems with a length 

 2 1-2 and 3 1-2 times their diameters. Palpi; the fii'st segment short, irregular, the 

 second with a length over twice its width, the thu'd 1-2 longer than the second, the 

 fourth a little longer than the third, slender. Mesonotum fuscous yellowish. Scu- 

 teUum and postscutellum yellowish. Abdomen pale yellowish, with a reddish 

 orange spot basally. Halteres yellowish transparent. Wings hyaline. Legs mostly 

 pale straw, the distal tarsal segments somewhat darker; claws slender, evenly curved, 

 the pulvilli as long as the claws. Genitalia fuscous yellowish, both dorsal and ventral 

 plates triangularly emarginate, each with the lobes sparsely setose apically. Type 

 a 2328. 



