DIPTERA. 323 



Chionea, Dalm. 

 C. aroneoides. The only species known ; it is found in win- 

 ter on snoAV and Ice *. 



A second subgenus might be formed Avith the Tipule atome of De 

 Geer — Mem. Ins. VIII, 602, XLIV, 27 — which is always apterous, 

 but whose antennae have at least fifteen joints, whereas M. Dalman 

 allowsbut ten to the preceding Insect. De Geer found this species 

 running very rapidly across his table. They are both very small. 



Another division of our Tipulariee, that of the Fungivora, is distin- 

 guished from the preceding ones by the presence of two or three 

 ocelli. The antennae also are much longer than the head, slender, 

 composed of fifteen or sixteen joints, a circumstance which removes 

 these Insects from the succeeding division. The eyes are entire or 

 emarginated. There is no division in the last joint of the palpi. The 

 wings are always incumbent and horizontal on the body, and their 

 ncrvures, longitudinal as well as transverse, are usually much less 

 numerous than those of the preceding Tibularire. The legs are al- 

 ways long and slender, and the extremities of the tibiae spinous. 



In some the palpi are curved, and composed of at least four very 

 apparent joints. The antennse are filiform or setaceous. 



Of these, some have the anterior extremity of the head prolonged 

 into a rostrum or proboscis, and in those where this elytron is less 

 considerable, the head is almost entirely occupied by the eyes. There 

 are always three ocelli. The antennae are short, and their joints but 

 slightly elongated. 



Those species, in which the eyes occupy almost tlje whole of the 

 head, where the ocelli are of equal size, and placed on a common emi- 

 nence, and where the rostrum projects and is not longer than the 

 head, form the subgenus 



Ryphus, Lat.i 



Those, in which the eyes only occupy the sides of the liead, where 

 the ocelli are not situated on a common tubercle, and where tlie an- 

 terior are smaller than the two posterior, and the rostrum is pro- 

 longed under the pectus in the manner of a proboscis, compose the 

 subgenus 



AsiNDULUM X. 



The subgenus 



Gnorista, Meig., 

 Only appears to ditfer from Asinduliun in the insertion of the palpi, 

 which, according to his figures, is near the extremity of the proboscis, 

 and not near its base. This remark was communicated to me bv M. 

 Carcel §. 



In no one of the following subgenera do we find the anterior j art 

 of the head projecting in the manner of a rostrum or proboscis. The 

 eyes are ahvays lateral. 



Sometimes the antennae, in the males at least, are longer than the 



* Dalm., Aaal. Entom., p. 35. 



t Lcit., Gcner. Crust, et luscct., IV, 251 ; Meig. Dipt. I, 155. 



: Lat., Ibid., Meig'., Ibid. 



§ Mcig., Ibid. 



