40 DIPTERA. 



Abdomen with yellow or green margins. 



Thorax greenish, with black stripes elegans, Wiedem. 



Thorax red, with black stripes tricolor, sp. n. 



1. Euparhyphus tricolor, sp. n., s . 



Face brownish-yellow in the middle, the sides black, which colour is entirely concealed under silvery pollen ;■ 

 proboscis yellow ; cheeks black ; occiput black ; lower occipital orbit silvery, with an indistinct yellowish 

 margin ; antennas and vertex black. Thorax above, including the scutellum, rufous ; its anterior end 

 black, emitting two broad black stripes, which stop immediately before the prasscutellar callosity ; the two 

 scutellar spines yellowish, with black tips ; a pale sulphur-yellow stripe runs from the humerus along 

 the dorso-pleural suture to the base of the abdomen ; sternum black, with some small sulphur-yellow 

 spots, the principal one being between the front and middle coxas ; metanotum black, as well as the callo- 

 sities' on its sides. Abdomen black, with yellow margins, which become narrower towards the tip ; venter 

 yellow, the base black. Coxas yellow ; the femora and tibiae reddish-yellow, the tibiae brownish at the tip, 

 the tarsi black ; first joint of the four posterior tarsi white, black at the tip. Knobs of the halteres green. 

 Wings subhyaline, the apex greyish from a little beyond the discal cell ; veins and stigma brown ; the 

 branch of the third vein is rudimental (as the other wing is injured, I cannot tell whether this is normal). 



Length 5 millim. 



Hob. Mexico, Northern Sonora {Morrison). A single male. 



2. Euparhyphus (?) decem-maculatus, sp. n., s . 



Male Eyes pubescent ; face black, with four yellow lines, the two lateral ones reaching the antennas, the inter- 

 mediate ones abbreviated above; facial orbits silvery and beset with short white hairs; vertical 

 triangle black ; two basal joints of the antennas brownish-yellow, rather elongated, of equal length ; 

 flagellum black, joints 1 to 3 short, the following joints longer ; occiput black, the lower part of the occipital . 

 orbit silvery Thorax black, sparsely beset with short hairs ; four longitudinal yellow stripes, the lateral 

 ones running from the humerus to a yellow spot on the post-alar callosity (the middle of the mesothorax is 

 injured by the pin in my specimen) ; a yellow line along the dorso-pleural suture runs between the humerus 

 and an oblique yellow spot in front of the wing ; several pale yellow, slightly greenish spots between the 

 root of the wing and the posterior coxas ; scutellum yellow, with two yellow spines which are black at the 

 tips Abdomen black, with three oblique yellow spots on each side ; three smaller, subtnangular spots in 

 the middle of segments 3-5; a transverse yellow spot with rounded sides on the sixth (last) segment, at 

 the tip Legs yellow; front coxas black, the tip yellow; front femora brown in the middle; the four 

 posterior femora infuscated on the latter half only ; on the front tarsi, joints 2, 3, 4, on the hind ones 

 joints 3 and 4, are infuscated. Halteres with a greenish knob. Wings hyaline, the veins and stigma rather 

 pale : branch of the third vein distinct. 

 Length 7-8 millim. 



Hab. Mexico, Northern Sonora (Morrison). A single male. 



N.B.— I place this species in the genus Euparhyphus, although in shape it is less elon- 

 gate' and broader, than the other species of that genus known to me. I can distinguish 

 three short joints, followed by three longer ones, on the flagellum, but the longer ones 

 I do not see distinctly. The fifth posterior cell is in contact with the discal. The 

 structure of the occipital orbits is like that of Euparhyphus. The pubescent eyes- 

 distinguish this species from those hitherto described. 



