NOVITATES ZOOLOGICAE XXI. Wll. 269 



vein, first longitiiiliiial except base and distal extremity, and proximal portions of 

 remaining longitudinal veins oraugc-ochraceous. 



Halteres bnff or cream-bnfF. 



Legs : all femora somewhat swollen, hind pair noticeably incrassate towards 

 distal extremities ; hair on inner and under sides of hind tibiae, and to a lesser 

 extent corresponding hair on middle and front tibiae also, long and bnshy ; claws 

 orange-buff, except rather less than distal half, which is clove-brown or black. 



Southern Algeria : type from the south of Ghardaia, 26-30. v. 1912 (Dr. 

 E. J. 0. Hartert and C. Hilgert). 



The species described above is closely allied to Dasi/f/iri.f rujicornis v. d. Wulp 

 (Trans. Ent. Soc. Land. 1899, p. 91, PL HI. fig. 3), the typical series of which was 

 taken in Arabia, at Aden and Shaik Othman, by Lieut.-Col. J. W. Yerbury. Apart, 

 however, from the diilerences in venation, to which attention has already been 

 drawn, Dasi/f/iiij- trianguUgera is distinguishable from D. ruficornis owing to 

 characters afforded by the antennae and abdomen. In D. ruficornis the third joint 

 of tlie antennae, instead of being bottle-shaped and longer than the first two joints 

 taken together, is described as " elliptical " and equal to the first joint in length, 

 while the dark markings on the dorsum of the abdomen, termed by van der Wnlp 

 " large spots or cross-bands," are not stated to be more or less triangular in outline 

 and clothed with mumm3--brown hair.* 



ASILINAE. 



Genus APOCLEA Macq. 



Apoclea helvipes Lw. 



(Beschr. europ. Dipl. Bd. iii. p. 141 (1873).) 



One S from the south of Ghardaia, Southern Algeria, 26-30. v. 1912 (Dr. 

 E. J. 0. Hartert and C. Hilgert). 



Herr Th. Becker, to whom the author is indebted for the identification of this 

 species, writes as follows : " The specimen is somewhat larger than usual, in addition 

 to which the scntellum has six marginal bristles instead of two. It is not impossible 

 that more bristles occur in the case of larger specimens ; I find no other differences, 

 and am not inclined to regard those mentioned as being of specific value." 



Genus DYSMACHUS Lw. 



Dysmachus sp. incert. 



One ? (indeterminable owing to condition) from Biskra, South Algeria (Hon. 

 L. W. Rothschild and Dr. E J. 0. Hartert). 



SYRPHIBAE. 



SYRPHINAE. 



Genus LASIOPTICUS Rond. 



Lasiopticus pyrastri L. 



(Syst. Nat. ed. x. p. 594 [Musca'] (1758).) 



One ? from Hammam R'Irha, North Algeria, May 1911 (Hon. L. W . Rothschild 

 and Dr. E. J. 0. Hartert). 



* Dasythrix trianijidigera is the only Algerian representative of its genus yet described. 



