1922] Bezzi: South American Chiromyza 121 



5. Chiromyza nigra n. spec. 



Type cT, a single specimen in the writer's collection from Ecuador, 

 received many years ago from Dr. J. Escher-Kundig, Zurich, Switz- 

 erland. 



This may be a melanic mountain form, but it is here described as 

 specifically distinct, chiefly on account of the peculiar shapeof the anal 

 cell, which recahs the condition of this same cell in the Bendmce. 



cf Length of body 11 mm., of wing 10 mm. 



Head entirely black, but the occiput and the face densely covered 

 with a dark gray dust. Ocellar tubercle deep black. Eyes bare, mti- 

 mately united, no distinct line being visible between them. Antennae 

 entirely black; the 2 basal joints are of about equal length; the third 

 joint is only a little longer than the two first joints together; it is 

 pilose, but i cannot perceive trace of its annulation because of its bad 

 preservation. Mouth parts rudimentary as usual. 



Thorax blackish-brown on the back, more reddish on the sides, with 

 a short darkish pubescence; pleurae dark brownish, more pale on the 

 stemopleura; hairs of meso- and metopleura very short. Scutellum 

 blackish, with more pale border; lateral depressions black. Halteres 

 with yellowish stalk, but with a black knob. 



Abdomen dull black, with shining black genitalia, which have the 

 upper lamella deeply emarginate and yellowish at end. Venter yellowish 

 grey. Coxce shining black, with the sutures reddish; femora yellowish, 

 with the apical part blackish-brown; tibiae and tarsi almost entirely 

 blackened, only the base of tibiae and of praetarsi being more pale; 

 claws black, with reddish base; the 4 posterior tibias are thickened and 

 a Httle curved as usual. 



Wings greyish hyaUne, with a faint yellowish tint on costal cell. 

 Discoidal cell open, only the lower part of the hind cross vein being 

 present; no rudiment of M3. Second posterior cell acute at base. The 

 two branches of M and the distal portion of upper branch of Cu are 

 very faint, almost spurious, perhaps due to immaturity of specimen. 

 The stalk of the anal cell is much longer than in any of the preceding 

 forms of vittata, being about as long as the preceding part of the postical 

 vein; surface of wing is microscopically pubescent as usual. 



IV. Barbiellinia new genus. 



Closely alhed with Chiromvza, but at once distinguished by the 

 long haired and broadly separated eyes of the male; moreover the hairs 

 of the body, legs and wings are much more developed than m the alhed 

 forms. According to Mr. Hardy, Austrahan species of Chiromyza have 

 either contiguous or separated eyes in the males; but the present case 

 is the first known among Brazilian forms, and is here assumed as being 

 of generic value on account of the unusual hairiness of the eyes. 



Head rounded, rather small size, more narrow than the thorax. 

 Occiput triangularly excavated above, with no prominent borders. The 

 three ocelli are of rather large size, placed in an equilateral triangle on 



