LYSIA. — PTKUODONTIA. 1G5 



subcylindrical, narrower at base, tip almost rounded; 3fd shining 

 chestnut- brown, base yellowish, lance-sliaped, the tip drawn out 

 into a long concolorous style, which is about as long as the whole 

 antenna; 2nd joint with yellow hairs. l""ace, except immediately 

 below antennae, deeply sunken between the eyes, shining black, 

 bare, narrower on upper part; occiput grey, covered aloug rhe 

 margin apparently with loug bristly bright yellow scale-like 

 pubescence.* Thorax moderately shining black on disc, with 

 apparently a slight jeneous tinge, the dark colour extending 

 forward in a broad baud to anterior margin ; rest of dorsum 

 bright yellow, including shoulders, humeri, and mesopleurse ; 

 ground-colour of scutelluui brownish yellow, tliat of reuuiiuder 

 of the pleurae grey or yellowish grey ; whole thoracic dorsum, 

 scutellum, and pleurae covered with tiense long bright yellow 

 bristly scale-like pubescence, Avliich becomes a little paler over 

 shoulders aud lower ])art of sides of thorax, and more orange over 

 scutellum and on hinder part of thoracic dorsum. Abdomen 

 yellowish brown, lighter on 1st segment and deeper on ;^id and 

 4th; all segments with a well-defined lemon-yellow hind border 

 of moderate width, broadest and least well-defined on 1st and 5th 

 segments, on which latter it occupies more than half tlie surface. 

 Whole dorsal surface covered with moderately short light brown 

 pubescence, and towards tip some microscopic ])ale yellow depressed 

 hairs. Venter mainly yellowish, with a blackish median band on 

 hinder part and some transverse black marks on 3rd and 4th and 

 following segments ; genitalia inconspicuous, hidden. Lec/s w holly 

 lemon-yellow with short soft concolorous pubescence. Winr/s 

 practically clear to base, distinctly ribbed ; veins brown ; thoracic 

 squamae pale yellow, with long briglit yellow fringe. 



Described from a single specimen in the British Museum, 

 labelled simply " Iiid." 



Genus PTERODONTIA, Gra>/. 



Pterodontia, Gray in Griffith's Anira. Kingd. xv, p. 779 (1832). 

 Fteredontia, Macquart, Hist. Nat. Dipt, ii, p. 514 (1835). 



Genotype, Pterodontia flavipes, Gray ; by original designation. 



Body of the normal Cyrtid type, pubescent. Head extremely 

 small, nearly wholly occupied by the eyes, which are v<-ry large, 

 contiguous in both sexes, densely pubescent; three ocelli; mouth- 

 opening more or less concealed ; proboscis short. Antt^nnoe 

 situated at bottom of head, 3-jointed; 1st cylindrical, 2nd short, 

 3rd conical, with (according to Macquart) a long bare style, but 

 in P. dorsalis with three very long tine stiff hairs.t Thoracic 

 lobes developed ; thoracic squama? enormously so. Abdomen 



* The head is so closely affixed to the tliorax that it is difficult to state 

 ■whether the adjacent pubescence belongs to the thorax or the occiput. 



t These might easily cling together, giving the appearance of a long bare 

 etyle. 



