Akt. 23 GENUS CYLINDROMYIA MEIGEN ALDEICH O 



signata have it on the second ; while the other species do not have it 

 at all. 



We have but one species, interviedia.^ with the hind tibiae villous 

 on the flexor side in the male; and only one species, dosiades, with 

 discal bristles (both sexes). 



The principal male genital organs for taxonomy are the forceps. 

 The posterior (or inner) originate at the sides of the anus, and are 

 usually of soft consistency. The anterior (or outer) are well chiti- 

 nized, blade-like. The penis is quite simple and seems to present no 

 tangible characters. The fifth sternite is here a delicate plate, hardly 

 more than a membrane, and usually invisible until the genitalia have 

 been pulled out of their cavity; it then shows important characters 

 in the width of the median incision, etc. 



The female genitalia are adapted for holding the host insect 

 during the insertion of the sting, which is much like that of a wasp. 

 The last segment turns up against the preceding portion of the 

 abdomen, and in most species has two lateral terminal unjointed 

 hooks; the presence of these and their shape are of importance in 

 separating the species. 



In the wing the sinuosity of the hind cross vein is of some im- 

 portance, but most of the supposed characters are variable and I 

 have made little use of them. 



Systematic position. — Fallen was the first to attempt subdivisions 

 corresponding to what we would now call families in the muscoid 

 group. He separated Ocyptera, Gymnosomu, and Alophora (which 

 he called Thereva) from his Muscides in a family Rhizomyzides 

 (Faun. Suec, 1820), Robineau-Desvoidy (Myodaires, 1830, p. 222) 

 proposed a group Ocypteratae, which apparently would rank be- 

 tween a subfamily and a tribe in the terms now used. Macquart 

 (Dipt, Nord France, 1834, pp, 142, 212) adopted the same name; 

 but as he greatly reduced the number of groups he in effect made 

 this of family rank, Schiner adopted Macquart's major groups with 

 but a slight change, having a subfamily Ocypterinae of equal rank 

 with his Tachininae and Dexiinae, Brauer and Bergenstamm at 

 first ^ recognized a family Ocypteridae ; but later they receded from 

 most of their family names and ^ then designated a " Gruppe Ocyp- 

 tera," which they placed between " Gruppe Pseudominthoidae " and 

 " Gruppe Micropalpus." In their third paper ^ they have a slightlj'^ 

 extended " Sectio Ocyptera," Girschner * seems to have made no 

 place for the genus, as it does not run to any of his divisions. Pan- 

 delle ■' has a subfamily Ocypterinae in his family Tachinidae. 



» Zvveifl. Kais. Mus., vol. 4, 1889, p. l.'^S. 



2 Vol. 5, 1891, p. 407. 



'Vol. 6, 1893, p. 143. 



* must. Wochenschrift f. Eiit., vol. 1, 1890, p. Ill and proccdinfr. 



"Kcv. Ent.. vol. 13, 1894, p. L'8. 



