152 DOLICHOPID.E. 



3. obscurus, Mg. zw. iv. 39. 7 (1824). JEneo-mridis, fronte et 

 hypostomate albo-micantibus, pedibus pallidis, tarsorum anticorum arti- 

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



Shining metallic green ; like P. -lugens, but the fore legs are entirely 

 yellow, only the last joint of the tarsus glossed with white 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. longulus, Fin. d. s. dol. 24. 4 (1823); Mg. ; Ztt. Obscure 

 aeneo-mridis, hypostomate parum albo-micante, pedibus pallidis, tarsis 

 fuscis simplicibus,femoribus anticis pectinatis. Long. 1^-2 ; alar. 4| 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 coxae 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. 



Bare. 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. Late <meo- 

 viridis, fronte et hypostomate albo-micantibus, pedibus pallidis, tarsis 

 fuscis simplicibus,femoribus anticis pectinatis. Long. 1^2 lin. 



Like P. longulus, 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. 



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



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

 Mg. (fcem.) Opacus glaucus, capite albido, abdomine nigro-fasciato, 

 pedibus pallidis, tarsis fuscis simplicibm ; Mas. femoribus anticis nudis. 

 Long, li-2 ; alar. 4 lin. 



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

 white. Abdomen with determinate dusky, or purplish-^c& bands, 

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

 base of the antennae, is a dull yellowish ; the tarsi are dwky, 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. Wiedemannii, with which it agrees 

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

 of the hypopygium is different, the undermost of the four appen- 



