STOMOXYS CALCITRANS 363 



Abdomen blotchy. Dark species. Fore tarsus in male with 

 first joint fringed on the inside with a row of hairs of equal 

 length . . . . . . . ". " . . . pulla (Male). 



7. Hind border of first three abdominal segments with a black 

 band. Femora clove brown, hind tibiae ochraceous buff, 

 frons, middle tibiae and tarsi mummy brown. Width of 

 frons one-fifth in male, almost one-quarter in female. Frons 

 in male constricted in middle ...... I im hata. 



Dorsum of second abdominal segment entirely clove brown, deep 

 posterior band on third segment. Frons and middle tarsi 

 pale brown, width of front wider than one-quarter width of 



head pusilla. 



6. Frons one-sixth in male, more than one-third in female. 

 Femora dark brown, tibiae and tarsi pale yellow. Abdomen 

 seen from behind at a very low level is banded . . , pratti. 



Frons one-sixth in male. Interocular space very straight. 

 Legs testaceous, coxae black, femora, brownish, anterior 

 ones lighter on inner sides, darker on outer sides. Abdomen 

 banded indica. 



Stomoxys calcitrans, L. (Plate XLIX, fig. 1). Frons in male about one- 

 fourth width of head, with fifteen fronto-orbital bristles ; arista with eight 

 or nine bristles on its dorsal surface ; palpi small. In female the fronto- 

 orbital bristles are irregularly arranged. Thorax, ground colour yellow- 

 ish to whitish grey with four brown to black longitudinal bands, the 

 outer pair interrupted at the suture. Abdomen, ground colour grey, some- 

 times yellowish, with a stripe on the second and third segments, not 

 reaching the lower borders; two lateral circular dark spots on each segment. 

 The fourth segment normally has a triangular basal spot or band which 

 may be very indistinct or even absent. In addition this segment nearly 

 always has two lateral stripes. The typical markings may, however, be 

 very indistinct, and all small, while in some specimens -the median stripes 

 on the second and third segments fuse together and form one band, extend- 

 ing on to the fourth segment ; the circular spots may be elongate and 

 form transverse bands. In many specimens from Kodaikanal, South 

 India, the abdomen was almost entirely black, and when this was noted 

 it was found that the wings were more or less frayed and even broken in 

 parts. 



In a recent paper on the transmission of polyiomyilitis through the 

 agency of Stomoxys calcitrans, Rosebau and Brues describe some experi- 

 ments in which they succeeded in infecting three 



monkeys out of twelve exposed to the bites of Sto- "elation to disease 



Bionomics 



moxys calcitrans which had previously bitten infected 



monkeys; this work has been confirmed by Anderson and Frost, who 



