58 On new Species of Fossorial Hymenoptera. 



ruginous. Thorax : the pubescence thin on the disk of the 

 mesothorax, but dense and bright at its margins, and also on 

 the prothorax and postscutellum ; the metathorax covered with 

 a thin, erect, pale pubescence ; wings flavo-hyaline, their ner- 

 vures ferruginous ; the teguke pale testaceous ; legs ferruginous, 

 with the coxee and base of the femora above blackish. Abdo- 

 men : the posterior margins of the segments broadly ferrugi- 

 nous, and covered with a thin golden pile; beneath ferruginous, 

 with the base of the first and second segments more or less 

 black. 



Hob. Ega. 



Tachytes simulans. 



Female. Length 5\ lines. Black ; the abdomen with pale 

 golden fascise. The face and clypeus covered with silvery 

 pubescence ; the mandibles ferruginous. Thorax : the sides and 

 beneath, covered thinly with a changeable hoary pile ; the pro- 

 thorax, margins of the mesothorax, and of the scutellum with 

 very pale golden pile ; the tibia? and tarsi have a pale 

 golden pile, their spines ferruginous ; wings flavo-hyaline, 

 with the nervures pale ferruginous ; the tegulse pale testaceous. 

 Abdomen thinly covered with a fine, changeable, golden pile ; 

 the posterior margins of the segments with fascia? of bright 

 pale golden pubescence ; the apical segment entirely golden. 



Hah. Ega. 



Tachytes frontalis. 



Female. Length 7 lines. Black ; the face densely clothed 

 with bright golden pubescence, that on the cheeks pale golden, 

 inclining to silver; the mandibles ferruginous, with some 

 silvery pubescence at their base. Thorax semiopaque, and on 

 the sides and beneath thinly covered with cinereous pubescence; 

 the margins of the mesothorax and postscutellum silvery ; the 

 legs pilose, more or less silvery in certain lights ; the spines 

 on the tibiae and tarsi ferruginous ; wings hyaline, the nervures 

 pale ferruginous, the costal ones fuscous ; a narrow fuscous 

 stain runs along the anterior margins of the front wings from 

 the base of the first submarginal cell to the apex of the wing ; 

 the sides of the metathorax with long hoary pubescence. 

 Abdomen : a bright silvery fascia on the posterior margins of 

 the first and three following segments ; the apical segment 

 covered with pale golden pubescence. 



Hob. St. Paulo (Brazil). 



Tachytes auro-vestitus. 

 Female. Length 9 lines. Black ; the head and thorax 



