246 PROCEEDINGS OF THE ACADEMY OP 



Such are the characters which separate from Limnophila nob., and in 

 general from the whole tribe of the T i p u 1 a r i ae with short palpi, a distinct 

 natural group, consisting of the three species described below, under the tempo- 

 rary generic denomination of Analopis Halid. and of P e d i c i a 

 Latr. This group has the following characters in common with Limnophila 

 nob. 



Two radial area ; tibia armed ivith spurs at the tip ; pulvilli distinct ; an'enna 16- 

 jointed, (17-jointed in A. inconstans nob ) 



The neuration of the wings is pretty much like that of P e d i c i a , (see Meig. 

 i. tab. iv. f. 14) ; but is very inconstant. It varies not only in the different 

 species of the group, but in different specimens of the same species, nay on both 

 wings of the same specimen. 



In A. c a 1 c a r , as well as in P e d i c i a , it is the cubital vein which forks, 

 instead of the radial. In A. i n c o n s t a n s it is sometimes the radial, some- 

 times the cubital vein which forks ; the passage from one to the other form is 

 very gradual, and shows the secondary value of this character in the present 

 genus. 



The discal areolet is wanting in A. occulta; it is generally present, but 

 sometimes wanting in A. inconstans; it is extant in the only specimen of 

 A. auripennis which I possess; finally in both of my specimens of A. 

 C a 1 c a r it is wanting on one wing and extant on the other. 



A constant and for this reason important character is the location of the 

 mediastinal cross-vein anterior to the origin of the petiole. 



Mr. Haliday was the first, I believe, who noticed (in Walker's Dipt. Brit, 

 iii. p. xv., Addenda,) that L. occulta Meig. had hairy eyes and a frontal 

 tubercle. On these two characters, and on the absence of the discal areolet he es- 

 tablished (1. c.) the genus A m a 1 o p i s . Although I do not know A. occulta 

 Meig., I have no doubt, from its description and the figures of its wing in the 

 authors, that it belongs to the same group with the three species described be- 

 low, although the location of these species in the same genus may be only tem- 

 porary. (I am certain, for instance, that A. inconstans with its 17-jointed 

 antennae will be formed into a new genus.) I prefer to retain in the mean 

 time for all the species of this group the name given by Mr. Haliday to one 

 of them. 



P ed i c i a undoubtedly belongs to the same group. It possesses all the above 

 mentioned generic characters, excepting, perhaps, the pubescent eyes. Although 

 Mr. Walker (Dipt. Brit. iii. p. 314,) asserts that the eyes are minutely pubescent, 

 I could not discover any traces of this pubescence in my specimens ; it may 

 have been rubbed off. 



The natural group, consisting of the genera Amalopis and Pedicia, 

 seems to hold an intermediate position between the T i p u 1 ar i as with short 

 and those with long palpi, (that is between L i m n o b i a Meig. and T i p u 1 a 

 Meig.) Although closely allied to the former, they approach T i p u 1 a by their 

 divaricated wings, their elongated palpi, the form of the discal areolet and the struc- 

 ture of the $ forceps. The genus Tricyphona Zett., unknown to me, 

 belongs, perhaps, to the same group. However, Zetterstedt describes the tibiae 

 as unarmed, and this would be an important difference. The genus Evani- 

 optera, established by Guerin, on a speeies from Brazil, (Voyage de la 

 Coquille, 1830,) seems also to belong hither. Limnobia littoralis Meig., 

 judging from the neuration of its wing, might be closely allied to my A. in- 

 constans. Limnobia u n i c o 1 o r Schum., ought, perhaps, to be located here 

 too. 



The habits of Amalopis are unknown, but they seem to be aquatic. The 

 larva of Pedicia rivosa has been found by Scheffer (see Rossi, Dipt. Aus- 

 triaca,) in spring-water. 



A. auripennis. Thorace cinereo, vittis tribus fuse is ; alis infumate 

 topazinis, nitidis, venulis centralibus infuscatis ; long. lie 5. 



[Aug. 



