83 THE ENTOMOLOGIST. 



Table of Genera. 



A. Abdomen of only 5 or 6 segments, Scutellum unspined, or with only 



2 spines. 



B. Discoidal cell, emitting 3 veins. .... PacTiygaster. 

 BB. Discoidal cell, or this and the posterior basal cell, together emitting 4 



veins. 



C. Scutellum spined, 



D. Thorax with a strong spine on each side. - - - Ephippium. 

 DD. Thorax unspined. 



E. Fhst antennal joint 3 or 4 times as long as the 2nd. Stratiomyia. 

 EE. First antennal joint at most twice the length of 2nd. 



F. Antennal style, short. ...... Odontomyia,, 



FF. Antennal style, long. Oxycera. 



CC. Scutellum unspined. 



G. Last antennal joint blunt, about ^ length of antenna. Nemotehis. 

 GG. Last antennal joint forming a thin style, at least as long as the antenna. 



H. Style seated before the apex. 



I. Ocelli equidistant. Chrysonotus. 



II. Front ocellus removed somewhat from the others. Sargus. 

 HH. Style seated at the apex. 



J. Eyes pubescent. CJiloromyia. 



JJ. Eyes bare. Microchrysa. 



AA. Abdomen of at least 7 segments. Scutellum 2, 4, or 6 spined. 



K. Discoidal cell emittmg 3 veins ..... Beris. 



KK. Discoidal cell emitting 4 veins. Actina. 



1. Pachygaster, Mg. (1804), Sys. Bfs. iii. 146. 

 = Vappo, Latr. ; Nemotelus, Panz. ; Sargus, Fall. 

 (Germar, in 1817, gave the name Pachygaster to a genus of Curculionidse). 



Basal half of wing blackish. .... ater. 



Wing entirely clear. ...... 



Legs pale yellow - - teachii. 



Legs black ; anterior tibiae and all tarsi yellow - tarsalis. 



M. Perris, a French Entomologist, considers the larva of 

 Pachygaster closely allied to that of Sargus. 



1. P. ater, Vsiuz. (1798), F, Germ. liv. 5. = pachygaster, Fall. 

 — Macquart gives some interesting notes on the larva in his 

 * Dipteres du Nord de France,' and Schilling figures it in Ent. 

 Beit i. pi. viii. 8. Rather common. 



2. P. leachii. Curt. (1824). Br. Ent. 42 = palUdipennis, Mcq. 

 — Walker mistakes femora for tibiae in speaking of the brown 

 spot on the hind pair. Not common. 



3. P. tarsalis, Zett. (1842), Dip. Scan. i. 152. — Very rare. 

 Mr. Verrall found one in the late Mr. Wilson Saunders' collection, 

 and introduced it to the British fauna in the Ent. Mo. Mag., 

 1886, p. 179. 



2. Ephippium, Lat. (1809), Gen. Crust. Ins. vi. 276. 

 = Stratiomys, Pz. ; Clitellaria, Walk. 



1. E. thoracicum, Lat. (1809),1. c. 276. = ephippium. Walk.,; 

 larva (figures), Westw. Class. Ins. ii. fig. 127, 128. — Very rare. 

 It has been taken in Coombe and Dareuth Woods. In the British 



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