620 INSECTA. 



In many, the wings are always extended, and the palpi long; with the last joint very long and annular. 



Ctenophora, Meig., has filiform antennae, pectinated in the males, and serrated in the females. Tipula pectini- 

 cornis, Fabr. 



Pedicia, has them nearly setaceous, simple, with the two basal joints thicker, and the seven terminal ones 

 6lender and subcylindric. 



Tipula, Latr., has also the antenna? nearly setaceous and simple ; but all the joints, except the second, are nearly 

 cylindric ; the first is largest, the third elongate. T. oleracea, the Common Crane Fly, or Daddy Long Legs, very 

 common in pastures; the larva feeds on the roots of dying plants, [and many other species]. 



Nephrotoma, Meig., has 19-jointed antennae in the males, and fifteen joints in the females, the third and following 

 being arched. 



Ptychoptera, Meig., has simple sub-setaceous antennae, 16-jointed; the third much longer than the others, and 

 the following oblong. 



In the following, the terminal joint of the palpi is scarcely longer than the others, and presents no appear- 

 ance of annuli ; and the wings are often incumbent on each other. Some of these have mere than 10-jointed 

 antennae. 



Rhipidia, Meig., has the male antennae pectinated. 



Erioptera, Meig., has, like the preceding, many nerves, but they are pilose. 



Lasioptera, Meig., has the wings villose, but only with two nervures. 



Limnobia, Meig., has the wings glabrous, and the antennae simple in both sexes. 



Polymcra, Weid., has 28-jointed antennae. 



Trichocera, Meig., has the basal joints of the antennae oval, and the terminal ones very slender, long, and pu- 

 bescent. T. hiemalis, the Winter Midge. 



Macropeza, Meig., has the hind feet exceedingly long ; the basal parts of the antennae are hairy. 



Dixa, Meig., appears allied to Trichocera, but the basal joint of the antennae is very short, second nearly globular, 

 and the following more slender. 



Megistocera, Weid., has only 10-jointed antennae. 



Hexatoma, Latr., has 6-jointed antennae, and consists of the Anisomerde and Nematocerte of Meigen, the first of 

 which has the third joint of the antennae much longer than the second. 



Chionea, Dalm., differs from all the rest in wanting wings ; the abdomen of the females is terminated by a bivalve 

 ovipositor ; the eyes are rounded, and the ocelli obsolete. The only species [known to Latreille] is found in winter 

 on the snow. C. araneoides, Dalm. 



The Tipule atome of De Geer forms another apterous subgenus, but the antennae have at least fifteen joints. It, 

 as well as the preceding, is very small. 



Another division, the Tijmles fungivores, is distinguished by possessing two or three ocelli; the 

 antennae, much longer than the head, slender, 15- or 16-jointed; the eyes entire, or notched; the last 

 joint of the palpi not articulated ; the wings horizontal, with much fewer nervures than in the preceding; 

 the legs long and slender, with the tips of the tibiae spinose ; some have the palpi curved, and composed 

 of four joints. 



Rhyphus, Latr., has the eyes entirely occupying the head ; the ocelli of equal size, and the muzzle advanced, and 

 not longer than the head. 



Asindulum, has the eyes occupying only the sides of the head, and the muzzle prolonged beneath the breast. 



Gnoriste, Meig., differs from the last only in having the palpi apparently inserted near the tip of the proboscis. 



In the following, the head is not produced into a muzzle. 



Bolitophila, has long antennae, and the eyes arranged in a transverse line. Guerin has published a complete 

 memoir on a species of this genus. 



Macrocera, Meig., has the male antennae very long, and the ocelli arranged in a triangle. 



In the rest, the antennae are never longer than the head and thorax. 



Mycetophila, Meig., has spined hind tibiae, and only two ocelli. 



Leia, Meig., differs from Mycetophila in having three ocelli ; the front one being very small. 



Sciophila, Meig., has the joints of the antennae more distinct ; and a small cubital cell. 



Amongst the subgenera with simple tibiae, and three ocelli close together, some have 16-jointed antennae, and 

 the eyes entire. 



Platyura, Meig., approaches Sciophila, but the first cubital cell is much larger ; the abdomen of the females is 

 broader behind. 



Synapha, Meig., has only a single cubital cell, closed by the hind margin of the wing ; the middle discoidal cell 

 is furcate in the middle, forming a closed oval cell. 



Others have the eyes notched in the inside. 



Mycetobia, Meig., has 16-jointed antennae, and the wings have a large closed cell, extending from the base to the 

 middle. 



Molobrus, Latr. (Sciara, Meig.), has similar antennae, and the middle of the wing exhibits a cell, extending from 

 the base to the hind margin, and closed only by this margin. 



Campylomyza, Wied., has only 14-jointed antennae, at least in the females ; the inner portion of the wings has 

 no nervures ; and the eyes are entire. 



