2IO INFECTION OF INSECT WOUNDS 



Miisca pattoni. 

 Austen (1910) gives the following description of this fly : 



'■'' Lengtii of S i'6 to S'^m/u., ? 6"S to ■j'S»i///.; xvidth of head i i'\ to ^ nun.; 

 9 2"8 ;//w. ; length of wing S 5*4 to I'd mm., ? 6"25 inni. 



'■'■Eyes in S almost in contact in centre of front, separated by little more than the 

 greatest width of stoutest thoracic macrochceta ; side of face in S , and of lower part of 

 front, viewed from above, b7-illiantly white ; front in ? of moderate width, its sides 

 {parafrontals) each at least half as broad, or more than half as broad, as frontal stripe; 

 thorax bronze-black, greyish or yellowish-grey pollinose, dorsum longitudinally striped 

 as in M. domes tica L., median grey stripe rather brighter in front ; abdomen 

 ochraceoiis-buff, or buff, with shimmering yellowish pollinose patches, and on dorsum a 

 clove-brown or black median stripe, at least on second and third segments, and a more or 

 less conspicuous and often triangular clove-broivn mark on apex of fourth segment ; in ? 

 extreme hind margins of second and third segments also clove-brown on dorstim ; zvings 

 hyaline ; legs black. 



'■''Head: ground colour blackish-grey pollinose, side of front in ? with a slight 

 yellowish tinge, distinctly grey right up to vertex when viewed somewhat from 

 behind, posterior orbits conspicuous above (yellowish-grey) in ? , but disappearing 

 above in <? ; occiput black ; frontal stripe black in ? , decidedly narrower than in ¥ 

 oi M. domestica L., the sides being slightly curved; first and second joints of antenna 

 black or blackish, third joint clove-brown, shimmering grey or yellowish-grey, 

 elongate, relatively narrower and distinctly larger than in M. domestica, arista (except 

 buff band behind thickened portion) and its hairs clove-brown, all hairs and bristles on 

 head, as also on body and legs, black. I'horax : dark stripes on dorsum narrower in 

 ? than in c? , in which sex the two dark stripes on each side of the median grey stripe 

 are sometimes more or less confluent ; median grey stripe on dorsum usually decidedly 

 broader than each admedian dark stripe ; scutellum sometimes entirely yellowish-grey 

 pollinose, but when viewed from behind showing a bronze-black apical spot, which 

 may be prolonged into a broad median longitudinal stripe. Abdomen: bright 

 shimmering yellowish pollinose patches on dorsum not visible on first segment, but on 

 the three following segments very conspicuous when viewed from certain directions, 

 and varying in shape according to the angle from which they are seen ; second and 

 third segments each with a longitudinal elongate rectangular pollinose patch on each 

 side of dark median stripe ; on the fourth segment these patches coalesce into one ; 

 a transversely elongate, semi-rectangular or partially ovate pollinose patch on each 

 side of the second, third and fourth segment ; latero-ventrally these lateral patches 

 curve round and reach the inner ventral edges of the dorsal scutes ; extreme base 

 of dorsum of first segment, beneath scutellum, clove-brown or black in 3 connected by 

 a clove-brown mark with median stripe on second segment ; median stripe usually 

 only about half as wide on third as on second segment, and often somewhat expanded 

 on anterior margin of latter ; hind border of third segment, a larger or smaller area on 

 each side of this segment sometimes more or less infuscated in <f ; dark mark on apex 

 of fourth segment sometimes connected with anterior margin, thus forming a 

 continuation of the median stripe ; hypopygium of i blackish, greyish pollinose. 

 Alar squama in i cream coloured, thoracic squama in S cream-bufi"; squaime in ? waxen 

 white. Legs : coxa-, posterior surface of front femora, and a streak on under surface 

 of middle femora, bright grey pollinose." 



