ART. :i5. XEW SPECIES OF THE GENUS DOLICHOPUS — ALDRICH. 5 



material, and the latter species is said to have the front coxae dark 

 at base, which might be specific. Frey includes discimanus under the 

 strictly arctic species along with mannerheimi ; I have quoted him 

 under that species. 



DOLICHOPUS AMPHERICUS Melander and Brues. 



DolicJiopns ampherlciis Melander and Brues, Biological Bulletin, vol. 1, p. 

 146, 1900.— Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p. 

 217, 1921. 



Forty-one specimens, Fairbanks, Alaska, June 30 to July 4. The 

 species has not been identified hitherto except in the type set of two 

 males and three females, collected in Price Countj^, Wisconsin, now 

 in the American Museum of Natural History. My specimens agree 

 with these except in having the hind tibiae somewhat infuscated on 

 the inner side at tip, and the front coxae provided with some black 

 hairs on the front side. I am indebted to Dr. Frank E, Lutz, curator 

 of insects in the American Museum, for the privilege of examining 

 these types. There is one excellent male character, present equally in 

 the types and my specimens, which at once distinguished this species 

 from all the nine related forms mentioned in Bulletin 116 (p. 219) : 

 On the sides of the first abdominal segment the pleural fold is rather 

 Avide open above, and in the hollow thus formed is a spot of minute 

 grayish tomentum or erect, short fuzzy hairs, filling the hollow and 

 extending a little dorsad of it. I have compared all the other nine 

 species on this point. 



DOLICHOPUS MANNERHEIMI Zetterstedt. 



DoUchopus mannerheimi Zetterstedt, lusi^-ta Lapponica, 1838, p. 707; 

 Diptera Scandinaviae, 1843, vol. 2, p. 500. — Becker, Nova Acta, vol. 102, 

 p. 163, 1920. — Frey, Acta Societatis pro Fauna et Flora Feunica, vol. 40, 

 Sep., pp. 4, 27, 1915. 



Twelve specimens, both sexes, collected at Camps 327 and 334 and 

 at Healy, Alaska, June 26 to July 13. 



Not heretofore reported from North America. Originally described 

 from Lapland. Frey includes it among a list of 20 species of Dolich- 

 opodidae of which he says (p. 4) : " The oldest postglacial Dolichopo- 

 did species are those * * * which now occur only in Lapland and 

 the Kola Peninsula, and here j^rincipally within the purely arctic 

 field and tundi-a regions. The limit of forest is not decisive for them, 

 as they may occur in the northern coniferous zone. * * * Their 

 southern limit is approximately the Arctic Circle." (Translation.) 



No Euroj^ean specimens have been compared, but the characters 

 are striking, and Zetterstedt's elegant description seems unmistakable. 

 The species is here redescribed for the benefit of American workers. 

 In Bulletin 116 it runs to laticornis in Group A on page 9, from which 



