THE MYCETOFHILID^. 



107 



front. They are said to resemble a thin gray snake when migrating 

 in this manner ; and he records the attack on these bodies by ants 

 and coleopterous larvae when on the march. Berthold* says " the 

 Heerwurm can be regarded as a collection of larvae, for the purpose 

 of mutual transformation : that is, it is accomplished through mutual 

 protection at a period favourable to development. This connection 

 is given up before the formation of nymphs arrives." 



Another feature of interest in Sciara larvre is the possible produc- 

 tion of galls by ^'. filico/a, as described by Winnertz, but Professor 

 Mik and Osten-Sacken seem inclined to doubt this. Of course it is 

 possible that the Sciara larvae live as inquiiines in the galls produced 

 by some Cecid. 



Fk:. 19. ^The three types of venation in Sciara. 



This genus has three well-defined types of wings, and is divided 

 into three distinct groups by the following characters : {a) The second 

 longitudinal joins the costal beyond the fork of the fourth longitudinal. 

 {b) The second longitudinal vein joins costal at the level of fork. 

 {c) The second longitudinal vein joins costal before the fork. 



•5". Thoiiuc. L. = 



.v. lateralis, Mg. 



Tipula Thomcp, Lin. and Schrk. 



Histea Thomce, F. 



Molobrus TJwmcc, Lat. 



This species has a black shining thorax. Abdomen fuscous ; the 

 ? has a yellowish band on each side. Antennre black, short, 

 smaller in ? than \n$. Wings almost black, and shiny ; the second 

 longitudinal vein extending much beyond the fork of the fourth, and 

 more than half length of wing. Legs short and moderately stout, 

 femora testaceous, coxae and tarsi dark brown. The abdomen and 

 thorax have dark brown hairs. 



This species, which is common, appears in the summer and 



* Nachrichten Univ. Guttingen, 1854, p. I. 



