DIPTERA. 2B5 



2. Merosargus spatulatus, sp. n. 



a 2 . Front and face of equal width throughout, shining blue-hlack, with a longitudinal groove on each side, 

 the lower portion light yellow : in the male the width equals that of the ocellar tubercle, the yellow 

 portion being a little longer than broad ; in the female the width is about twice that of the male, and the 

 yellow portion is nearly square. Antennae, face, and proboscis light yellow, the pile of the same colour. 

 Thorax light yellow ; mesonotum broadly black, as though formed by three confluent stripes, the lateral 

 ones of which are abbreviated in front ; scutellum black, with the margin yellow ; the black of both 

 mesonotum and scutellum is obscured by light golden pile. Metanotum shining black ; an elongated 

 black spot on each side of the pectus. Abdomen slender for the first three segments, in the male nearly 

 cylindrical, in the female increasing more gradually in width ; distal portion spatulate ; shining black, 

 with the broader posterior and narrow anterior margin light yellow, the hind margin of the fifth segment 

 yellow ; hypopygium, and the venter in great part, light yellow. Legs light yellow, the hind coxae in 

 great part, the hind femora, except the base and tip, aud the two distal joints of all the tarsi, black or 

 blackish ; middle tibia? in great part, the central portion of the front tibia?, and also the immediate tip of 

 the third joint of all the tarsi, brown or brownish. Wings with a yellowish tinge ; the furcation of the 

 second and third veins takes place nearly opposite the middle of the discal cell. Length 9-10 millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 



Seventeen specimens, including four females. I place this species in the genus 

 Merosargus, because of its great resemblance to others which seem properly to belong 

 there. I must confess, however, that I do not know how to distinguish it from 

 Chrysochroma. From M. orizabce, Giglio-Tos, to which the present species seems 

 allied, M. spatulatus may be at once distinguished, inter alia, by the white second and 

 third tarsal joints. From M. cercaceus it will be best separated by the colour of the 

 mesonotum and the length of the first antennal joint, which is shorter than the second 

 and third together. 



3. Merosargus bulbifrons, sp. n. (Tab. IV. figg. 8, 8 a, 2 .) 



$ . Front broad, its width equal to one-half the distance between the ocelli and the root of the antennas, 

 strongly convex tranversely and prominent in profile above the ocular margins ; shining reddish-yellow, 

 bare ; on the lower part yellower and with a small tubercular white spot near each eye-margin. Antenna? 

 reddish-yellow, the first joint yellower and about equal in length to that of the other two joints together. 

 Face yellow. Proboscis reddish-yellow. Thorax light yellow, the mesonotum and dorsum of scutellum 

 light reddish or brownish-yellow. Abdomen brownish or reddish-yellow, apparently somewhat blackish 

 in the middle of the posterior segments ; gradually increasing in width from the base of the second 

 segment to the fourth segment, where it is fully three times wider. Legs reddish-yellow ; all the tarsi 

 brownish, becoming blackish distally, the metatarsi of the front pair lighter-coloured. Wings yellowish- 

 hyaline ; the furcation of the second and third veins takes place opposite the anterior cross-vein. Length 

 12 millim. 



Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H. H Smith). 



One specimen. This species, in the peculiar conformation of the front, is evidently 

 allied to M.frontatus, Schiner, but may be at once distinguished from it by the absence 

 of black on the front, thorax, &c. 



4. Merosargus concinnatus, sp. n. (Tab. IV. fig. 9, s .) 



j Front and face of equal width, equal to more than one-third of the distance from the ocelli to the root of 

 the antenna, shining black or blue-black, lightly sulcate on the sides, the lower third light yellow. 



2 A 2 



