ART 18 DTPTEEA OR TWO-WINGED FLIES ALDRICH 7 



Described from one female and two males, collected by F. X. Will- 

 iams at Bancs, Oriente, Ecuador, altitude 6,000 feet. One of each 

 sex was captured on October 30, 1922 ; the other specimen was taken 

 " On Luma Tree, " January 19, 1923. Received from the Hawaiian 

 Sugar Planters' Experiment Station. 



Type.— Female, Cat. No. 27130, U.S.N.M. 



PHOBEMA, new genus 



Wing like Anastrepha; ovipositor like Toxotinjpana; face with 

 distinct antennal grooves, separated by a broad, rounded carina, 

 which becomes more prominent upward, projecting in a rounded knob 

 between tlie antennae at their base, widely separating them. The 

 front is wide and flat and protuberant, making approximately a 

 right angle with the face ; there are two upper f rentals turned back, 

 the postverticals are present, the ocellars present but very small. 

 Thoracic chaetotaxy: posterior dorcentral 1, far back; humeral 1; 

 notopleural 2; presutural 1; supraalar 1; postalar 2; mesopleural 1 

 near upper hind edge; scutellar 2 pairs. 



The relationship is with Anastrepha, from which the greatly 

 elongated ovipositor would not separate it; but the facial structure 

 is very different. 



Type of the genus. — Phohema atrox, new species, 



PHOBEMA ATROX, new species 



Ferimle. — General color brown tending toward yellow. Head dark 

 yellow, tlie carina shining and translucent, the antennal grooves with 

 whitish pollen ; antennae dark yellow, reaching a little over halfway 

 to the epistoma ; third joint hardly twice the second, arista thin and 

 bare. Palpi rather large and flat, yellow; probocis short, fleshy. 

 Bucca (beloAv eye) hardly one-third eye height. Back of head 

 somewliat translucent. 



Thorax dark yellow, scutellum triangular, short, halteres with 

 brown knobs. Abdomen broAvn; first and second tergites united 

 without suture, their sternites however distinct; sixth tergite very 

 short, with a row of black hairs behind ; seventh abdominal segment 

 (ovipositor) longer than the whole of the rest of the fly, round in 

 cross section, dark and curved upward at base, thence nearly straight 

 iiud yellow, the extreme tip blackish. 



Wing large and long, hyaline with yellow pattern as in Ancistrepha, 

 pseudoparallela as figured by Loew.- Fourth vein distinctly curved 

 forward just before reaching the margin as in the genus Anastrepha. 



Male. — Front not quite so protuberant; abdomen clavate, lateral 

 borders of tergites 3 — 5 with large hairs slanting backward, 



2 Mod. N. a. Diptera, vol. 3, pi. 11, fig. 24. 



