88 TACHYTES POMPILIFORMIS. 



Fam. 5. Larridae, Leach. 



The mandibles emarginate exteriorly towards their base ; the 

 anterior and intermediate tibice with a single spine at their apex, 

 the posterior pair with two spines. 



Genus 1. TACHYTES. 



Larra, pt., Fabr. Ent. Syst. ii. 220 (1793). 

 Pompilus, pt., Fabr. Syst. Piez. 187 (1804). 

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

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

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



Head transverse, wider than the thorax ; the eyes converging 

 at the vertex ; the posterior stemmata obsolete ; the mandibles 

 large, arcuate and acuminate, bidentate within, deeply emar- 

 ginate on the exterior towards their base, forming a dentate 

 process. Thorax ovate ; the metathorax short, rounded at the 

 sides, gradually inclined above, as broad as long ; the anterior 

 wing with one marginal cell, more or less acuminate at the apex, 

 not truncated, and three submarginal cells, the second receiving 

 both recurrent nervures. Abdomen short, ovate-lanceolate, sub- 

 sessile, not longer than the thorax, usually subdepressed above ; 

 the apical segment with the disk flat, the margins reflexed, the 

 apex acute. 



1. Tachytes pompiliformis. 

 T. niger ; abdominis basi rufo. 



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



Spin. Ins. Lia. 173. 18 $ . 

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

 Tachytes pompiliformis, Van d. Lind. Obs. ii. 21. 5 $ . 



Shuck. Foss. Hym. 89. 1. 



St. Farg. Hym. in. 252. 15. 



Wesm. Hym. Foss. Belg. 72. 1. 

 Tachytes pectinipes, Dahlb. Hym. Europ. 127. 63? 



Female. Length 3| 4-|- lines. Black; a deep depression be- 

 hind the tubercle, which occupies the situation of the posterior 

 stemmata; the interior margin of the eyes and the clypeus 

 covered with a silvery-white pubescence ; the apex of the man- 

 dibles ferruginous. Thorax slightly shining, very closely and 

 finely punctured ; the metathorax finely granulated ; the trun- 

 cation transversely striated, with a deep fossulet in the centre 



