Coenomyiidae. 85 



This species varies much in colour, tlie variation cliiefly consisting 

 in the abdomen being more, or quite, black, and the paie designs 

 lience more pronounced and distinct; thougli the variation is in reality 

 not great, yet the species may exhibit a very different aspect; tiie 

 varieties have therefore also oflen been established as separate species. 

 The description I have given above agrees with all Danish specimens 

 I have seen. — The fly is recorded to emit a somewhat cheese-like 

 smell which may continue long time after it is dried. 



C. ferruginea is very rare in Denmark, only six specimens have 

 been taken in all; at Hillerød (Miss Hannemann), at Boserup near 

 Roskilde (Liebenberg, Schlick), and one specimen with locality Sealand 

 (Stæger). 



Geographical distribution: — Northern and middle Europe from 

 Southern Sweden to Italy ; in middle Europe it seems to occur especially 

 in the mountainous districts. It occurs also in North America. 



TANYSTOMA. 



Tabanidae. 



Head rather short, semiglobular or transverse, arched in front, 

 and in the males sometimes much so, somewhat concave behind, as 

 broad as or a little broader than the thorax. Antennæ placed near 

 to each other, six- to seven-jointed (in Pungonia ten-jointed), the three 

 or four last joints as a rule forming an annulated style. Eyes touching 

 in the males, well separated in the females and then leaving in the 

 middle a more or less broad frontal band; in the male the facets in 

 the upper part of the eye often larger than below. The eyes more 

 or less liairy or bare ; the colour often green or golden green with 

 purplish or bluish hånds or spots. Ocelli wanting or present in 

 a number of three. The parts of the head surrounding the oral 

 aperture not membranous, and thus there is no oral cone; clypeus is 

 not separated from the epistoma, it is generally excised in the males 

 on the front margin, the excision being membranous and the labrum 

 connected to it; in the females this membrane is very small. Proboscis 

 more or less protruding, generally subvertical, sometimes very long 

 and directed more forwards, in sonie species even more than twice 

 as long as the body (Pangonia). Mouth parts in the female consisting 

 of a labrum, mandibles, maxillæ, hypopharynx and labium, the four 

 first named parts forming long chitinous blades: in the male the 



