60 HYMENOPTERA. 



the inner side of the eyes, and not raised into more or less blunt ridges. The meta- 

 thorax is usually shorter, or, at least, hardly longer, than the mesothorax, and rounded 

 at the apex; the body is hairy and bee-like; and the apex of the radial cellule is 

 rounded. Nearly 150 species of Tachytes (and Tachysphex) have been described from 

 all the zoological regions ; and sixteen are known from North, and twenty-four from 

 South America. 



l. Tachytes yucatanensis. (Tab. IV. fig. 18, $ .) < ,u . ,o 



Niger ; tibiis tarsisque ferrugineis ; alis f ulvo-fumatis. $ . 

 Long. 17-18 millim. 



Hal. Mexico, Temax in North Yucatan (Gaumer). 



Antennae sparsely microscopically pilose, the scape bearing long white hairs ; the 

 third joint about one quarter longer than the fourth. Head below the ocelli covered 

 thickly with rather long fulvous hair, the front, vertex, and occiput more sparsely with 

 fuscous, intermixed with pale, hair. Eyes at the top separated by about the length of 

 the second and third antennal joints united ; ocelli surrounded by a distinct margin and 

 by a furrow on the outer side of the latter. Vertex and front opaque, closely punc- 

 tured. Clypeus closely punctured; the apex broadly rounded, slightly projecting. 

 Mandibles at the base reddish and closely covered with short fulvous hair ; palpi rufous. 

 Thorax opaque, closely and rather strongly punctured ; the pronotum above and the 

 pleurae and sternum bearing pale golden hair, the sides of the mesonotum thickly 

 covered with fulvous hair ; the rest of the mesonotum and metanotura with long pale 

 fuscous hair. There is an elongated fovea in the centre of the metanotum at the apex. 

 Abdomen as long as, or a little longer than, the thorax, shining, aciculate ; the sides of 

 the basal three segments bearing a silvery pile. Pygidial area with a distinct lateral 

 margin, rather sharply rounded at the apex, and covered thickly with deep coppery- 

 golden pile ; apical ventral segment at the apex bearing some large coarse punctures 

 and some long hairs ; the penultimate segment also punctured at the apex and bearing 

 some long rufous hairs ; the ventral segments pale at the apices. Legs bearing a golden 

 or silvery pile, the spines and spurs rufous : the tarsal spines paler than the tibiae ; the 

 hind tibiae broadly blackish in the middle ; the claws blackish. The second cubital 

 cellule at the top is a little shorter than the third, and somewhat longer than the space 

 bounded by the two recurrent nervures. 





! 



v 2. Tachytes guatemalensis. (Tab. IV. fig. 19.) - 60 y^ 



Niger, fusco-hirtus ; alis fere hyalinis, antice fulvo-fumatis. $ . 

 Long. 16 millim. 



Hal. Guatemala, Mirandilla 1700 feet (Champion). 



Antenna? not much longer than the pro- and mesothorax united, thick, the nagellum 



