3 52 DOLICHOPID/E. 



3. obscurus, Mg. zw. iv. 39. 7 (1824). yEueo-viridis, fronte el 

 hypostomatc albo-micantibus, j^edidm palUdls, iarsoruvi anticorum arti- 

 culo ultimo albo-micaute, Mas. Long. 2 lin. 



Shilling metallic green ; like P. lugeu-s, but the fore legs are entirely 

 yellow, only the last joint of the tarsus glossed with ?c/ute in the male, 

 which has the fore femora pectinated. The other legs are yellow, with 

 the tarsi somewhat brownish. 



This description is derived from Meigen, who received his spe- 

 cimen from England. In the collection of Mr. Clifton. (E.) 



4. longtdus, Fin. d. s. dol. 24. 4 (1823); Mg. ; Ztt. Obscure 

 mieo-viridis, hypostomate parum ulho-micante, pedihus palUdis, tarsis 

 fuscis simpUcihus,femoribus anticis pectinatis. Long. 1^-2; alar. 4f lin. 



Dull metallic green, shining. Face very broad, with a faint shifting 

 white gloss; front green or cyaneous. Abdomen not distinctly banded, 

 belly pale. Legs pale yellow, posterior coxas with the base grey in the 

 male only ; tarsi dusky except at the base ; they are simple, and the 

 fore femora pectinated, in both sexes. 



Eare. In Messrs. Curtis and Haliday^s collections. (E.) 

 Obs. The number and length of the appendages of the hypo- 

 pygium, in this and the species which follow, are nearly as in P. 

 Wiedemannii, with some differences in form and pubescence. 



5. lugens, Mg. zw. iv. 38. 6 (1824); Mq. ; Ztt. Lcete ceneo- 

 viridis, fronte et hypostomate alho-micantihus, pedihus pallidis, tarsis 

 fuscis simpUcibus, femoribus anticis pectinatis. Long. 1^-2 lin. 



Like P. longidus, but of a brighter metallic green ; the face with a 

 decided white gloss extending to the front also. The differences seem 

 scarcely sufficient to separate the two. 



Eare. In Mr. Stephens's collection. (E.) 



6. contristans, Wd. z. m. i. 72. 19 (1817) ; Fin.; Z\i.—regalis, 

 Mg. {foem.) Opacus glaucus, capite albido, abdomine nigro-fasciato, 

 pedibus 2)(dlidis, tarsis fuscis simjilicibus ; Mas. femoribus anticis nudls. 

 Long. 1^-2; alar. 4 Im. 



Greenish-grey, almost without metallic shine. Face and front glossy 

 wliite. Abdomen with determinate dusky, or purplish-ZiZac'^- bands, 

 which are broader in the middle. The colour of the legs, and of the 

 base of the antcnnee, is a dull yellowish ; the ta7'si are dusky, except 

 the base, and simple in both sexes. The fore femora of the male are 

 bare of spines or long hairs. 



Not common ; but extant in the principal collections of British 

 Diptera. (E.) 



Obs. P. contristans, Mg. (zw. iv. 37. 4), is not the same spe- 

 cies, but rather resembles P. Wiedenianmi, with which it agrees 

 ill the character of the fore legs of the male ; but the structure 

 of the hypopygium is diil'ereut, the undermost of the four appen- 



