OSTEN SACKEN ON WESTERN D1PTERA. 233 



concluded too hastily that the habitat assigned to them by Fabricius 

 was erroneous,* and transferred the name to the European species; all 

 the European authors have followed his example since. The zealots of 

 priority will probably insist upon changing the name of the European 

 species, now adopted in all the works on European Biptera ; in my opin- 

 ion, it is much more in accordance with the true interest of science to 

 preserve a name which has been so long in use, and merely to strike 

 out the quotation from Fabricius. Furthermore, it may turn out in the 

 end that E. dorcadion is the same species as the European E. capucina, 

 in which case there will be no occasion for a discussion. 



6. Exoprosopa caliptera Say, Journ. Acad. Phil., iii, 46 (Compl. 

 Writings, ii, 62). — To Say's very clear description, I will add a state- 

 ment about the silvery spots on the abdomen, taken from two well pre- 

 served specimens in my possession. A silvery cross-band on the second 

 segment occupies two thirds of the breadth of the segment, and is 

 deeply emarginate in the middle; a silvery spot on the posterior corners 

 of the third segment, and a silvery longitudinal streak in the middle of 

 each of the segments 4, 5, and 6. The latter character is important, 

 as it does not exist in E. dorcadion, otherwise so closely allied. I caught 

 this species near Cheyenne, Wyo,, August 21, and also received a spe. 

 cimen from Morino Yalley, New Mexico, collected by Lieut. W. L. Car- 

 penter, July 1. 



Observation. — There is an Anthrax caloptera Pallas (see Wiedem., Zool. 

 Magaz., i, 2, 12, and Meigen, Syst. Beschr., ii, 173), which Wiedemann 

 considered the same as A. capucina Fab., and therefore put among the 

 synonyms. As the name will probably never be revived, Say's name may 

 be retained. 



Walker's Anthrax calif omice agrees better with this species than with 

 E. dorcadion. 



7. Exoprosopa fascipennis Say is well known. Anthrax noctula 

 Wiedemann (Auss. Zw., ii, 635, 45) and Exopr. coniceps Macquart (4e 

 suppl., 108) are its synonyms. Exopr. phila delphica is, 1 suspect, only 

 a smaller variety, which occasionally occurs. 



8. Exoprosopa emarginata Macquart, Dipt. Exot., ii, 1, 51. — Vir- 

 ginia, Georgia, not rare. 



9. Exoprosopa tittjbans n. sp. — Head grayish black; antennae 

 black ; style of the third antennal joint nearly as long as the joint ; face 

 beset with a golden-yellow scaly tomentum ; oral margin reddish; front 

 with some golden scaly hairs and black pile ; posterior orbit with short, 

 appressed, white hairs; proboscis not protruding. Thorax black, with 

 dingy-yellowish pile; scutellum reddish, with yellow pile. Abdomen 

 black in the middle, reddish on the sides; anterior half of the second 

 and the fourth and sixth segments with a cross-band of white scales ; 

 the latter half of the second and the other segments beset with yellow- 



* The passage from Wiedemann's Zool. Mag., i, 2, 12, is quoted by Meigen, Syst. Beschr., 

 ii, 173. 



