THE MYCETOPHILIDA. 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 larve 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 Scéara larve is the possible produc- 
tion of galls by .S. “ico/a, as described by Winnertz, but Professor 
Mik and Osten-Sacken seem inclined to doubt this. Of course it is 
possible that the Scéara larvee live as inguilines in the galls produced 
by some Cecid. 
Fic. 19.—The three types of venation in Sczara. 
This genus has three well-defined types of wings, and is divided 
into three distinct groups by the following characters : (#2) The second 
longitudinal joins the costal Jeyond the fork of the fourth longitudinal. 
(4) The second longitudinal vein joins costal a¢ the level of fork. 
(c) The second longitudinal vein joins costal defore the fork. 
S. lateralis, Mg. 
Tipula Thome, Lin. and Schrk. 
Histea Thome, F. 
Molobrus Thome, Lat. 
S. Thome, L.= 
This species has a black shining thorax. Abdomen fuscous ; the 
?has a yellowish band on each side. Antennz black, short, 
smaller in? than ing. 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, cox and tarsi dark brown. The abdomen and 
thorax have dark brown hairs. 
This species, which is common, appears in the summer and 
* Nachrichten Univ. Gottingen, 1854, p. 1. 
