SUBULA,— SAEGTJS. 23 



that of the European S. marginata, only the second posterior cell is more ventricose in 

 the middle, and more attenuated at the base. A single male, indifferently preserved. 



N.B. — S. elongata, like S. americana, has comparatively a more slender body, longer 

 legs, and antennae than S. marginata. Subula fulviventris, Bigot (Mexico), for which 

 Bigot has introduced the genus Macroceromys, has still longer antennae ; in other 

 respects the definition of this genus shows nothing to distinguish it from Subula ; by 

 adopting it we should be embarrassed as to which of the two genera to assign our Subula 

 elongata, as it is midway between the others in regard to the length of the antennae. 



For Subula, which is preoccupied (Mollusca, 1817), Prof. Rondani has proposed the 

 name Xylomyia. I think, however, that a change in a name of such old standing 

 involves much more inconvenience than its retention. 



SAEGUS. 



Sargus, Fabricius, Entom. System. Suppl. p. 566 (1798). 



1. Sargus ? 



Eab. Panama, Bugaba (Champion), A single male. 



Belongs to the group of green, metallic species, with a dark bronze-coloured abdomen ; 

 the hind margins of the abdominal segments paler, and beset with a fulvous, appressed 

 pubescence, and segments 1 and 2 coarctate. A number of the existing descriptions 

 agree more or less with this specimen, and I cannot say whether there are several closely 

 allied species, or whether the same species is subject to variation ; probably both alter- 

 natives are true. S. lucens, Loew, Centur. vii. 11 (Cuba), has " alae fuscae," while in my 

 specimen they are, at most, " fuscescentes." The same remark applies to the description 

 of S. clavatus, Walk. List &c. v. p. 93 (Para), the wings of which are described as 

 " blackish." S. alchidas, Walk. List &c. iii. p. 517 (Jamaica), differs apparently only in 

 the colour of the halteres. S. contractus, Walk. List &c. v. p. 319, and Macrosargus 

 tenuiventris, Bigot, Ann. Ent. Soc. Fr. 1879, p. 225 (both from the Amazon River), must 

 be closely allied to the above-quoted species. These species (at least in my specimens 

 of S. lucens, Loew, and M. tenuiventris, Bigot) have contiguous eyes in the male sex. 



2. Sargus concinnus, sp. n., <j $ . 



Thorax red above ; scutellum and metanotum dark metallic ; abdomen with the first and second segments pale 



yellow, the others metallic purplish-blue, with more or less distinct yellow hind margins. 

 Length 11-12 millim. 



Hab. Guatemala, San Geronimo (Champio7i). — Beazil, Villa Nova, Amazon River 

 (Bates). 



Face blackish, the proboscis yellow; antennae reddish-yellow, the scapus paler, beset with 

 short black pile ; arista slender, reddish at the base ; lower part of the front swollen, of 

 a dingy yellowish colour ; the rest of the front and the vertex metallic blue, with greenish 



