230 ]\Ir. J. 11. Mallocli on E.votic Muscavid^ 



iu centre ; Kscutellum always bare on sides and ventrally ; 

 hind tibia in female with two or three short postero-dorsal 

 bristles. 



Genotype, Spilugaster fnrtipes, Macquart. 



Ket/ to Species. 



1. Males 2. 



Females 6. 



2. Hind tibia remarkably dilated as in some 



species of bees ; fore tibia with remarkably 

 long strono; hairs ventraUy ; mesogternum 

 •with a long stout process which is directed 

 downward and armed at apex with a dense 

 clump of blackbackwardly directed bristles, hirtipes, Macquart. 

 Hind tibia normal, not noticeably dilated ; 

 mesosternumbutlittle produced do wn■^^Tard. 3. 



3. Hypopleura bare ; fore and hind tibiae rather 



densely long-haired ventrally ; anterior 

 iutra-alar bristle absent ; eyes separated 

 by at least one-third of the head-width ; 

 each orbit with five equally long, strong 



bristles which are equally spaced villipes, sp. n. 



Hypopleura with a few very short hairs in 

 middle below spiracle; fore and hind tibife 

 with very short hairs; anterior intra-alar 

 present ; eyes separated by about one-fifth 

 of the head-width ; each orbit with a wide 

 space at centre without bristles 4. 



4. Hind trochanters with very fine hairs hirtiventris, sp. n. 



Hind trochanters with dense, short, stout, 



rectangularly bent bristles troclumterntus, sp. n. 



5. Legs largely reddish yellow; fourth tergite 



but little depressed at apex in centre ; fore 

 tibia with one posterior and two antero- 



dorsal bristles hirtipes, Macquart. 



Legs entirely black ; fourth abdominal tergite 

 very noticeably depressed in centre at apex. 6. 



6. Anterior intra-alar bristle absent ; fore tibia 



with one posterior and two antero-dorsal 



bristles villipes, sp. n., or 



Anterior intra-alar bristle present ; fore tibia [trimaculata, Stein, 

 with two antero - dorsal bristles, the 

 posterior bristle absent hirtive7itris, sp. n. 



Idiopyyus hirtipes (Macquart). 

 Spilogaster hirtipes, Macquart, Dipt, exot., Suppl. 1, p. 202 (1846). 



I give a description of this remarkable species, as the 

 original is very short and deals only with the male. The 

 legs are stated by Macquart to be entirely black, but they 

 are not so in the specimens before me. 



