80 CHRYSOPS DIMIDIATUS. 



34. Chrysops dimidiatus, n. sp. 



Thorace piceo vitta laterali flava ; abdomine fulvo-ochraceo , 

 fasciis duabus nigris; antennis rufo-fuscis , capite duplo lon- 

 gioribus ; palpis pedibusgue fulvis^ alarum dimidio basali 

 subhyalino ^ apice fusco, basi costaque testaceis. — Q. Long. 

 8,5 mm. 



Antennae twice as long as the head, slender, dark red- 

 dish-brown , black towards the end. Front with a greyish- 

 brown dust; above the antennae a semicii'cular , shining 

 testaceous knob ; face with a brownish-yellow dust , in the 

 middle with a shining cojBfee-brown , oblong knob. Rostrum 

 brown , slender , longer than the head ; palpi rufous. — 

 Thorax piceous , with a short fulvous pilosity ; on the upper 

 part this pilosity does not cover the derm; by its greater 

 density it forms yellowish spots on the pleurae and coxae 

 and a yellow lateral band from the shoulders to the root 

 of the wings; the hind margin of the thorax and the 

 whole scutellum covered with a testaceous dust. Abdomen 

 reddish-ochraceous , with two rather broad black longitu- 

 dinal bands, which begin at a little distance from the 

 base and , at their end , flow together with the darkbrown 

 color of the last segments ; at the underside this marking 

 is more or less visible; the abdomen has a fulvous pilo- 

 sity, especially on the sides of the first segments. Legs 

 yellowish-red; the last joints of the tarsi dark brown; 

 hind tibiae straight, a little enlarged and with a not very 

 obvious dark pile. Halteres dark brown. Wings testaceous 

 at the base and along the anterior margin, then hyaline 

 with some greyish tinge as far as the end of the basal 

 cells; the remaining portion till the apex entirely dark 

 brown , the usual dark crossband being confounded here 

 with the border of the apex and hind margin; the sepa- 

 ration is hardly indicated by some clearer spots; on the 

 contrary the color is much darker at the beginning of the 

 subcostal and auxiliar veins and along the central cross veins ; 

 the postical vein has a small brown border along its whole 



Notea from the Leyden ]VIuseutzi, "Vol. "VII, 



