from the Rio Xautia, State of Vera Cruz. 27 



Proboscis quite strongly elongate, very distinctly more than in 

 S. stylosa, each of the two sections being 5 millim. long in the 

 largest specimens, making whole length 10 millim., not io' 

 eluding the base; each section 4 millim . in small specimeris. 

 Proboscis white at tip, yellowish at base. Thorax black 

 above, except the pale whitish humeri ; on sides whitish, 

 with a broad fascia of black extending from dorsum, between 

 humeri and base of wings, down to base of middle coxffi. 

 Scutellum black, faintly pale yellowish on lower edge. 

 Abdomen black, a half-round whitish-yellow spot on each 

 side at base of segments two to five. These spots are clothed 

 more or less with whitish pile, especially on their anterior 

 portions, and are largest on the third and fourth segments, 

 but occupy less than half the length of the segment. Ovi- 

 positor elongate, somewhat longer than abdomen, composed 

 of two segments ; basal segment about one third longer than 

 terminal, black, with base yellow ; second segment black, 

 yellowish at base and clothed with white hair on its basal 

 half, thus giving the ovipositor its conspicuous silvery-white 

 ring before tip. Appendages of second segment of ovipositor 

 same as in aS^. , stylosa, except that the under sheath-like 

 extension is short and rather more blunt at tip, being only 

 one half or one third the length of spatulate organ, and the 

 parts are blacker. The spatulate organ and the two palpi- 

 form organs at its base are rather thickly clothed with longer 

 black hairs, the former from a side view looking like a 

 feathery or short-plumose arista. Front and middle legs 

 pale yellow, finely short black-hairy, the cox£e whitish and 

 mostly bare, the bases of femora blackish, those of middle 

 femora more broadly so ; tibiae whitish and white-hairy 

 except on outer side of proximal two fifths ; the tarsi tinged 

 with brownish and thickly clothed with short black hairs ; 

 hind legs black, the coxa3 shining black and appearing seed- 

 like on posterior surface, the femora broadly pale yellowish at 

 each end and with a whitish or pale yellowish ring in middle; 

 the tibiae with a broad white ring clothed with white hair 

 just before tips. Wings evenly infuscated; halteres fuscous 

 except the rufous-yellow stalks and bases. 



13. Stylogaster viinuta, sp. n. 



Seven female specimens and ten males. 



6 2 ' Length of female 4 millim., not including ovipositor ; 

 length of latter 2 millim. Length of male 5 to 5^ millim. 



This species, save for its small size, looks at first sight 

 very much like S. stylosa, but differs from it in the foUownig 

 characters, which are very constant : — Front wholly brown 



