BY ROWLAND E. TURNER. 279 



$ $ . A. First abdominal segment with a distinct transverse carina 

 before the apex. 



a. Head black, thorax and legs ferruginous. Sparsely punc- 



tured. T, abdominalis Guer. 



b. Black, thorax and legs ferruginous. Closely punctured. 



T. punctata Sm. 



B. The carina before the apex of the first abdominal segment 



either absent or indistinct. 

 a. Tarsal ungues bifid. 

 a'^. Abdominal segments closely and finely punctured. T. adusta Sm. 

 62. Abdominal segments sparsely punctured, the punctures 



large. T. incana Sm. 



h. Tarsal ungues simple. 

 a'^. Strongly punctured. Second abdominal segment broadly 

 emarginate on the apical margin, 

 a^. Head not much narrowed posteriorly. T. anfhracina Sm. 



6^, Head much narrowed posteriorly. T.fascipennis, n.sp. 



C. Pygidium contracted at the base. 



a. Sparsely punctured. Second abdominal segment not emar- 

 ginate on the apical margin. T. Jlavopicta Ritsema. 



T. ABDOMINALIS Guer. 



Agriomyia {Tachynomyia) abdominalis Guer., Mag. de Zool. xii. 

 p.5, 1842((J). 



Aelurus abdominalis Westw., Arc. Ent. ii. 2, p. 122, 1844{(J). 



Agriomyia {TacJiynomyia) spinolce Guer., Mag. de Zool. xii. p. 6, 

 18-t2(^). 



Thynnus ftrvidus Erichs., Arch.f.Naturgesch. viii. Pt.l, p.263^ 

 11.237, 1842(^). 



ThyiDius abdominalis D.T., Cat. Hym. viii. 100, 1897((J) [nee 

 Fabr.]. 



This species may be recognised by the light ferruginous colour 

 of the abdomen with the basal segment black. T. spinolca Guer., 

 seems to be merely a colour-variety, as Guerin himself suggests. 

 In spite of this Ashmead makes the two forms the types of dis- 

 tinct genera, erroneously choosing spi7iohe as the type of Tachyno- 

 m,yia. I have seen specimens in which the black colour of the 

 thorax is replaced by a ferruginous-red as noticed by Smith, and 

 also intermediate forms. 



