ASHArEAD : r-LASSIFICATION OF THF: CHAT.CID FLIES 4G1 



yellow. Wings hyaline, the veins lirownisli-yellow. The abdomen is long, conic- 

 ovate, a little longer than the head and thorax united, subconipressed, smooth and 

 shining, the petiole short, rugose, not or hardly longer than thick. 

 Brazil : Coruniba, in May ; Santarem. Five specimens. 



ISOSOMODES NIGRICEPS, sp. IIOV. 



(Plate XXXIII., Fig. 2.) 



Male. — Length 4.5 mm. IJrownish-yellow, the head above, the abdominal 

 petiole, a spot at base of second dorsal abdominal .segment, a spot at apex of the third 

 and fourth dorsal segments, all the following segments above, black ; eyes brown, the 

 ocelli red. The head has a deep frontal channel ; the antenna3 are long, filiform, in- 

 serted a little above the middle of the face, the scape reaching beyond the ocelli, 

 the pedicel of same being very short, the funicle joints long, about two thirds the 

 length of the scape, briefly pedicellate and with two wliorls of long, black hairs as 

 in fsosuma. 



IJrazil : Santarem. One .specimen. 



Genus ISOSOMA Walker. 



I.SOSOMA ORCHIDEARUM WestWOOd. 



Ixosomu 07-c7i7't/<Y//'(/7/i Westwood, Gardener's Chron., 1869, p. 330. — Westwood, Trans. 



Ent. Soc. London, 1882, p. 323, 9 d" ; PI. L3, f. L d", 4 9.— Fitch, Trans. 



Ent. Soc. London, 1884, Fnjc, p. xi. — IMacLachlan, Trans. Ent. Soc. London. 



1884, Proc, p. xiv.— Riley, Insect Life, L, 1898, p. 121.— Riley, Insect Life, 



II., 1890, pp. 250, 251.— Dalla Torre, Cat. Hym., V., 1898, p. 349. 

 Brazil : Living in buds of Catfleya sp. 

 This is probably not a true I.^osoma. 



TKir.K III. Eiirijidmini. 



Genus CHRYSEIDA Spinola. 

 Chryseida amazonica Westwood. 

 Chnjmda aniazoniea Westwood, Thesaus. Ent. Oxon., 1874, j). 140; pl. 20, f 5, 9. 

 —Dalla Torre, Cat. Hym., V., 1898, p. 352. 

 Brazil. 



Chryseida cyanea (Fabricius). 

 Clialcis cyanea Fabricius, Syst. Fiez., 1804, p. 164, 9. 



6'//n/.ve/d(/ c//«7tf'a Ashmead, Proc. Ent. Soc. Washington, III., 1895, p. 100, 9. — 

 Dalla Torre, Cat. Hym., V., 1898, p. 352. 

 Brazil : Chapada. A single female specimen taken in April. 



