80 



DIPTERA or NORTH AMERICA. [PART IV. 



believe to be the same species. It shows some slight differences, 

 the most striking of which is, that the brown spot at the tip of 

 the first longitudinal vein is limited posteriorly by the second 

 longitudinal vein ; whereas in my North American specimens, it 

 crosses this vein and invades the inner end of the submarginal cell. 



2. G. tlivei-sa 0. S. % and 9.— Thorace cinereo, vittistribus obscure 

 fuscis ; veuffi auxiliaris apice prafurcae initio plus minusve opposite. 



Thorax gray, with three dark brown stripes ; the tip of the auxiliary vein 

 is nearly opposite the origin of the prsefurca. Long. corp. 0.25 — 0.28. 



Syx. Geranomijia diversa 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 207. 



Proboscis, palpi, and antennae black ; front and vertex grayish. 

 Thorax with a grayish bloom above and with three well marked 

 dark brown stripes ; pleurae, scutellum and metathorax hoary, 

 their ground color brownish ; halteres with a brown knob ; feet 

 tawny, coxae and basis of the femora paler. Abdomen brown; 

 male forceps paler. Wings slightly tinged with brownish ; stigma 

 very slightly darker ; a slight, hardly perceptible nebulosity at 

 the origin of the praifurca ; the marginal cross-vein forms an 

 obtuse angle, sometimes nearly a straight line, with the tip of the 

 first longitudinal vein ; the tip of the auxiliary vein is opposite 

 the origin of the prsefurca. 



Hab. Trenton Falls, N. Y. 



The proboscis of this species is much shorter than that of the 

 two other species. The male of Limnohiorhnnclius hraziliensis 

 Westw. {Ann. Soc. Ent. de Fr. 1835, p. 683) is a Geranomyia, 

 which is not unlike G. diversa; the stripes of the thorax are 

 likewise narrow antl dark, and the position of the marginal cross- 

 vein is the same. I have seen the specimen in Mr. Westwood's 

 collection, without having subjected it to a close comparison v.^ith 

 G. diversa. 



3. CS. canadensis Westw. % and 9. — Thorace pallide fnsco, vittis 

 tribus obscurioribus ; vena auxiliari pone prsefurcse initium extensa. 



Thorax pale brown, with three darker stripes ; auxiliary vein extended 

 beyond the origin of the prsefurca. Long. corp. 0.25 — 0.28. 



Syn. Limnohiorliynchus canadensis Westw. Ann. Soc. Entom. de Fr. 1835, 

 p. 683. 

 Geranomyia communis 0. Sacken, Proc. Ac. Nat. So. Phil. 1859, p. 207. 



