HYMENOPTERA. 295 



bright in different lights ; the metathorax finely rugose, and with 

 a central longitudinal carina which extends to the verge of the 

 truncation ; wings hyaline, faintly clouded at their apical mar- 

 gins, the nervures pale testaceous • the intermediate and posterior 

 tibiae with a double row of pale testaceous spines externally. 

 Abdomen with the two basal segments ferruginous, covered 

 with a fine downy pile; the apical margins of the second and 

 third segments with fasciae of silvery pile, only observable in 

 certain lights. 



Hab. Brazil. 



Genus 4. TACHYTES. 



Apis, pt., Rossi, Faun. Etrus. Mant. i. 143 (1792-4). 

 Sphex, pt., Fahr. Ent. Sijst. ii. 215 (1793). 

 Lyrops, Illig. Ed. Faun. Etrus. (1807). 

 Tachytes, Panz. Krit. Revis. (1806). 

 Larra, Panz. Faun. Germ. 89. 13. 



The genus Tachytes, as treated in this Catalogue, contains 

 those species only which possess the following characters,— the 

 type being the Tachytes pompiliformis of Panzer. 



Head transverse, wider than tlic tliorax ; the mandibles large, 

 arcuate and acuminate, within bidentate, deeply emarginate on 

 the exterior towards the base, or notched, forming a dentate pro- 

 cess. Thorax ovate; the prothorax almost concealed beneath 

 the convex gibbosity of the mesothorax ; the metathorax short, 

 rounded at the sides, gradually declined above to the apex, not 

 sharply truncated, as broad as long ; the superior wings with one 

 marginal cell, more or less rounded at the apex, not truncated; 

 three submarginal cells, the second receiving both recurrent ner- 

 vures. Abdomen short, ovate-lanceolate, subsessile, not longer 

 than the thorax, usually subdepressed above ; the apical segment 

 with the disk fiat, the margins reflexed. 



Species of Europe. 



Sect. 1. Abdomen red and black. 



1. Tachytes pompiliformis. B.M. 



Larra pompiliformis, Panz. Faun. Germ. 89. 13; Krit. Revis. ii. 129. 



Spin. Ins. Lig. ii. 173. 18. 

 Larra dimidiata, Panz. Faun. Germ. 106. 13 5. 

 Tachytes pompiliformis. Van d. Lind, ii. 21. 5(7 ? 



Shuck. Foss. Hym. 89. 1. 



St. Farg. Hym. iii. 252. 15. 



