242 SUPPLEMENT. 



Differs from H. lativentris in the yellow head and antennae, yellow border of the 

 scutellum, markings of abdomen, &c. Five specimens.] 



13. Hermetia ceria, sp. n. (Tab. IV. fig. 13.) 



Front black, the large bare tubercle shining blue-black ; on either side of the ocelli a yellow spot, another 

 near each orbit below, and a pair of small ones above the root of the antennae. Antennae red, the style 

 black ; third joint very long and slender, fully twice the length of the style. Eyes pilose. Mesonotum 

 and scutellum opaque black ; a small spot on the humeri, the post-alar callosities, and the narrow margin 

 of the scutellum, luteous; pubescence golden. Abdomen shaped much as in the species of Ceria, 

 broadest at the posterior part of the third segment, where it is fully twice as wide as at the distal 

 margin of the first segment ; opaque black, the second segment, save the narrow lateral margins, light 

 yellow ; posterior margins of the second and third segments with golden pile ; fourth and fifth segments 

 covered With similarly coloured pile, more abundant on the hind margins. Legs black; the basal 

 portion of the hind tibiae and the front and hind tarsi light yellow (middle legs wanting in the specimen 

 described). Wings with the anterior border brown, sharply distinguished from the posterior part, which 

 is nearly hyaline. Length 10-11 millim. 



Hab. Mexico, Ventanas in Durango 2000 feet (Forrer). 



I have ventured to describe this species from a single specimen, not in a very good 

 state of preservation, and the sex of which I cannot determine, on account of its 

 striking characters. It resembles certain species of Ceria and Conops. 



CHRYSOCHLORA. 



Chrysochlora, Latreille, Eegne Anim. p. 486 (1829). 



It is perhaps strange that so little has been written concerning this genus, estab- 

 lished so long ago, considering the fact that specimens of various species belonging to 

 it are not at all rare in collections. About half a dozen American forms have been 

 described, some of which it is quite certain do not belong to it, or at least are not 

 congeneric with such species as C. vespertilio. If C. amethystina (Fabr.), from the 

 Isle of France, is taken as the type, it seems probable that the American species will 

 have to be separated, especially so if Macquart is correct in his statement that the 

 males of C. amethystina have the eyes contiguous. In the six American forms known 

 to me the structure of the body throughout is quite alike in the two sexes, except that 

 the antennae are more elongate in the female than in the male. Nor am I aware of 

 any differences in coloration between the two sexes. In fact, in single specimens, 

 when the genitalia are withdrawn within the abdomen it is often difficult to 

 determine the sex. A separation of the American species is also very desirable from 

 the fact that they are light-coloured insects, with much uniformity of markings, while 

 C. amethystina is deep metallic green and blue in colour. The heterogeneous character 

 of the species at present included in the genus is noticed by Loew in his paper on 

 Sargus (Verh. zool.-bot. Ges. Wien, 1855). I have already remarked (Trans. Am. 

 Ent. Soc. xv. p. 1) that it is difficult, if not impossible, to determine the described 



