232 SUPPLEMENT. 



Two specimens from Mexico agree with those mentioned by me from Brazil 3 . I 

 have scarcely a doubt that the name S. coarctatus is a synonym of S. notatus. 



4. Sargus caesius. 



Sargus casius, Bellardi, Saggio etc. i. p. 40, t. 1. fig. 18 ( ? ) \ 



Sargus filiformis, Giglio-Tos, Mem. della Reale Accad. delle Sci. di Torino, (2) xliii. p. 28 (<$) 2 . 



Hab. Mexico, Omilteme, Xucumanatlan, and Sierra de las Aguas Escondidas in 

 Guerrero 7000 to 9000 feet (H. H. Smith), Angangueo (Saussure l ). 



Two males and fifteen females. This species, placed by Osten Sacken (antea, p. 41) 

 amongst the unidentified Central- American Stratiomyidae, may perhaps belong to the 

 genus Sargus, but the sole character which I understand as characteristic of it — ■ 

 the inequidistant position of the ocelli — is very feebly marked, especially in the female. 

 Giglio-Tos described the male. The females differ so greatly that it was only after 

 careful scrutiny that I felt satisfied of their identity. I give therefore a full description 

 of both sexes: — 



<$ . Head shining black, with two elongate, tear-shaped, subcontiguous, white spots on the upper part of the 

 frontal triangle; pile yellowish and blackish. Eyes almost contiguous immediately above the white 

 spots. Antennae black, the third joint sometimes in part brown. Proboscis yellow. Mesonotum shining 

 resplendent green, with short reddish-yellow pile ; post-alar callosities red : a slender stripe along the 

 dorso-pleural suture, the two nearly connected across the prouotum, yellowish-white. Pleurae shining 

 blue-black. Scutellum shining green, with a broad red margin. Metanotum shining green, the sides 

 with red spots. Abdomen slender and elongate, shining black, with the very small posterior angles to 

 the segments yellow or yellowish. Legs luteous-yellow ; the four distal joints of the front tarsi, three 

 of the middle, and all of the hind pair brown or blackish ; hind tibiae and the distal portion of the hind 

 femora brownish or brown. Wings lightly infuscated, the stigma narrow, elongate, and brown. 



5 . Front and face of equal width, the white spots on the lower part of the former small, rounded, and 

 distinctly separated. Mesonotum yellowish-red, with a broad median stripe shining black, with purple 

 and blue reflections ; in some specimens the mesonotum is better described as having the margins broadly 

 yellowish-red. Pleurae wholly reddish-yellow, save a small black spot above the front coxae ; pectus 

 black. Metanotum blue-black, on the lower part at least. Abdomen flattened, elongate, pointed 

 posteriorly ; shining blue, with purple reflections, the lateral margins narrowly yellow or yellowish. 

 Hind femora without the brownish colour distally and the hind tibiae with a distinct, median, yellowish 

 ring. Length 9-14 millim. 



ACROCHJETA. 



Acrochata, Wiedemann, Aussereur. zweifl. Ins. ii. p. 42 (1830). 



l. Acrochseta fasciata. 



Acrochceta fasciata, Wiedem. Aussereur. zweifl. Ins. ii. p. 42 x ; Maeq. Hist. Nat. Dipt., Suites a 

 Buffon, i. p. 260 2 ; Walk. List &e. v. p. 68 3 ; Loew, Verb., zool.-bot. Ges. Wien, 1855, p. 147 4 ; 

 Giglio-Tos, Mem. della Reale Accad. delle Sci. di Torino, (2) xliii. p. 112, t. 1. ff. 6, 6a, b 5 . 



Hab. Mexico 5 , Orizaba 5 , Teapa (H. H. Smith). — Beazil 1 . 

 A single specimen from Teapa, agreeing with the descriptions. 



