BY C. ir. JIAFJIIY. 533 



Uncertain generic positiox. 



grandicornis Hordy [XeiK/iiiorplia), (Tusnuuiia). 



BOREOIDES, u.gen. 



subidatiiri n.sp. (New South Wales, Victoria, aiitl ? Tasmania). 



Allognosta Osten-Sacken. (Synonyms. — Metoponia Loew, ner .Mai-(|uail anrl 

 Anucautlioberis Brunetti.) 

 fuscitarsia Say [Syn. — dorsalis Say, brevis Walker, IiUu Walker, pallipea 

 Wiedeiiiann] ( Unilei! States of America), obscuriventris Loew (Canada), 

 si milts Loew (United States of America), vagans Loew [Syn. — iiiermis Bru- 

 netti] (Europe and Asia), crassitarsis de Meyere (Java), crassa de Meyere 

 (Java), barbieUinii Bezzi (Brazil), assamerisis Brunetti (Assam). 

 Of the above twenty-three species the flrst fifteen belong to the Chiromyzini, 



and the eight species under the genus Allognosta probably belong to the same 



tribe. 



T desire to record my thanlcs to Mr. J. A. Kershaw, of the National Museum, 



Melbourne, for the loan of specimens of Chiromyzini under bis charge, which 



included the manuscript species, Boreomyia subulata Walker also to Miss Irwin 



Smith and Dr E. W. Fero-uson who have afforded me every np])(irtunity to 



examine specimens in their collections. 



Tribe CHIROMYZINI. 



Definition. — The antennae are situated low down on the head, ai-e short, and 

 are composed of three short joints, the third of which consists of several segments 

 which ai'e fused or almost fused, so that they are found not to foi'm independent 

 segments when dissected; the face recedes. The scutellum is without spines and 

 its contour is smooth. The abdomen contains seven segments* ; the male has the 

 genitalia exposed, and the female has a protensive ovipositor containing a pair of 

 cerci. The wings, when at rest, lie horizontally and partly overlap above the 

 abdomen; they have a venation which is variable in each species; at most the 

 wings <-ontain a full complement of veins occurring in the family Stratiomyiidae, 

 or certain veins consisting of the upper branch of the cubital fork, the third 

 posterior vein, and the cross-vein between the second and fourth posterior veins 

 may be partly or completely obsolete. The tifth ]3osterior vein issues from the 

 second basal cell and joins the anal vein considerably before it reaches the wing 

 margin. The female is apterous in one genus. 



Notes. — The tribe Chiromyzini is adopted here as the characters of the genera 

 placed under it are not of sufficient importance to wan-ant their isolation from 

 the subfamily Beridinae. Osten-Sacken made a family of the genus Chiromi/za, 

 and Kertesz, in his catalogue, treats it as a typical form of a subfamily under 

 the family Coenomiiiidae bnt does not associate the genus Allognosta with it. The 

 genus Allognosta is not known to me but judging' from the chai-acters ]>ublislied 

 it appears that the species placed under it belong to the tribe defined above. 



Key to the genera of the tribe Chiromgsini. 



I. The eyes separated in both sexes; the two basal joints of the antennae equal in 



length, the third joint of the male four times the length of the second and 



of the female only twice the length: the male with wings, the female 



apterous Boreoides, n.gen. 



•All the works dealing with Beridinae seen by the writer state that the abdomen has 

 seven visible segments; actually, however, there are eight visible in the female, 

 not including the apical one, usnally referred to as the ovipositor and which 

 contains the cerci. 



