1882.1 175 



white ; the wings clear, and the legs as in the male, but less hairy. There is no 

 doubt but that the Musca decolor of Fallen, also described by Meigen and Zetter- 

 stedt by that name, all of whom only knew the female, is the opposite sex of T. 

 cunctans, though neither of the first two authors were aware of it. Zetterstedt* 

 suspected that his A. innocens might be the same as Meigen's cunctans, and adds 

 that perhaps it is the male of A. decolor. The description of his A. innocens, 

 however, does not apply to T. cunctans in some points. 



T. SEMIPELLUCIDA, Zett. 



This very well marked species has been confounded with Meigen's Lasiops 

 apicalis, which there is no doubt is the same as Hyetodesia semicinerea, Wdm. T. 

 semipellucida also beai's a very strong general resemblance to that species, and they 

 are often mixed up in collections ; but they may easily be distinguished by the fol- 

 lowing characters : in H. semicinerea the arista is decidedly sub-plumose both in 

 male and female, while in T. semipellucida it is almost bare in both sexes ; in H. 

 semicinerea the thorax of the male is more glabrous, and there is a patch of white 

 reflections on each shoulder, which is absent in the other species ; the wings of the 

 males are only slightly darkened along the anterior margins in H. semicinerea, 

 while they are quite fuscous in T. semipellucida ; the abdomen is of a pale trans- 

 parent yellow colour in H. semicinerea, with the apical segment black, together with 

 a black dorsal central stripe, and black posterior margins to the segments, while in 

 T. semipellucida the abdomen is of a dull brownish-yellow colour, darker towards 

 the hinder part, with transverse black stripes, but without the central dorsal stripe 

 or the black apex ; the legs of the males are decidedly longer in H. semicinerea than 

 in T. semipellucida, and the posterior tibia) are ciliated on both sides with long hairs 

 in the former, but are almost bare in the latter. 



This little fly is generally distributed, but not very common. 



T. PPLCHEK, sp. n. 



Mas, niger, nitidus ; oculis ienuiter hirtis ; abdomine oblongo-ovato, cinereo, 

 albo-micanie, sub-striato ; alis subfuscis ; halter ibus fiavidis ; pedibus simplicibus. 



Femina, obscure cinerea ; oculis sub-nudis ; thorace abdomineque concoloribus 

 innotatis ; alis hyalinis. Long. \\ and 2 lin. 



<J . Read : eyes sub-contiguous, with short hairs ; forehead and face not pro- 

 minent, epistome slightly projecting ; antenna? a little prolonged, the third joint 

 about twice as long as the second j arista long, thickened, and slightly pubescent at 

 the base, the remainder slender and bare. 



Thorax with Scutellum shining brownish-black, and unstriped. 



Abdomen hairy, oblong-oval or conical, of a brownish-grey colour when viewed 

 from before backwards, but when seen in the opposite direction, appearing of a 

 glistening whitish- or bluish-grey colour (glaucous), marked with faint brown dorsal 

 reflections, assuming the form of a dorsal stripe, dilating into indistinct triangular 

 spots or patches ; sub-anal organs small. 



Wings more or less tinged with brown ; third and fourth longitudinal veins 

 slightly diverging at their extremities ; external transverse vein straight and upright. 



* Dipt. Sean<t, vol. iv, p. 1523. 



