DIPTERA. 
429 
II. Antennas 13-join ted. 
A. Two cross veins between first longitudinal vein and anterior branch of 
second vein 38. Dicranota (Zett.), 
B. One cross vein as above. 
1. Four posterior cells 39. Plectromyia, g. n. 
2. Five posterior cells 40. Rliaphidolabis, g. n. 
Of the two aberrant sections, the Cylindrotomina include : — 
I. Head, and intervals of thoracic stripes, with dense deep punctures. 
42. Triogma (Schin.). 
II. Head smooth. 
A. Colouring of Pachyrhina, yellow and black. 
41. Cylindrotoma (Macq.), 
B. Colouring of Tipula^ brownish and greyish. 
43. Phalacrocera (Schin.). 
And tlie Pty diopter ina arc divided into : — 
I. First submarginal cell much shorter than second. 
4G. Pi'otoplasa (O.-S.). 
II. Second submarginal cell much shorter than first. 
A. Three posterior cells 46. Bittacomorpha{W QBiw.), 
B. Four posterior cells 44. Ptychoptera (Meig.). 
Osten-Sacken also characterizes (/. c. pp. 330-336) the other described 
genera of this group which are unrepresented in Europe and North America, 
referring them to his sections as follows : — Periplxeroptcra (Schin.) to Lim- 
nobina ; Btyringomyia (Loew) and Paratropesa (Schin.) to Limnobina ano- 
mala; Sigmatomera (O.-S.) and {?) Lachnocera (Phil.) to Eriopterina; 
Gynoplistia (Westw.), Cloniophora (Schin.), Cerozodia (Westw.), Ctedonia 
(Phil.), and (?)Polymoria (Phil.) to Limnophilina ; Evanioptera (Gu^r.), 
Pterocosmus (Walk.), Oligomera (Dolesch.), and Physecrania (Big.) to Ani- 
somerina; (?) Polymera (Wied.) to Amalopina; and Tanyderus (Phil.) to 
Ptychopterina. 
Plate I. contains figures of the wings of the following species : — Dicra^ 
nomyia longipennis (Schum.), puhipennis (O.-S.), and hcaretica (O.-S.), Tro~ 
cliohola argus (Say), Elephaxxtomyia ivestwoodi (O.-S.), Toxorrhina magna 
(O.-S.), Cylindrotoma nodicornis (0.~^.)yDicranoptycha sohrina (0.-^.), Ori- 
marga alpina (Zett.), Elliptera omissa (Schin.), Antocha opalizans (O.-S.), 
Teucholahis complexa (O.-S.), Atarha picticornis (O.-S.), Rhypholophus nu- 
bilus and rubellus (O.-S.), Erioptera chhropliylla^ and armata (O.-S.) 
and an undetermined species, and Symphcta punctijxennis (Meig.). Plate II. 
contains wings of the following: — Trimicra pilipes (Fab.), Goniomyia sul- 
phurclla (O.-S.), Limnophila rujibnsis (O.-S.), Goniomyia sxibcincrea (O.-S.), 
Gnophomyla tristissima (O.-S.), Limnophila areolata (O.-S.) and montana 
(O.-S.), Epiphragma solatrix (O.-S.), Limnophila quadrata and luteipennis 
(O.-S.), Cryptolabis paradoxa (O.-S.), Anisomera megacera $ (O.-S.), Tri~ 
chocera bimacula (Walk. .P), Amalopis calcar and inconstans (O.-S.), Dicranota 
rivularis ^ (O.-S.), Phaphidolabis tenuipes (O.-S.), PUctromyia modesta 
(O.-S.), Ptychoptera rufocincta (O.-S.), and Bittacomorpha clavipes (Fab.). 
Plates III. and IV. show the characters of the forceps of the males of the 
1869. [voL. VI.] 2 G 
