Hagen.] 246 [October 23, 
csophacus, the part where the mouth is commonly placed is here 
closed by a membrane going from the base of the labrum to the base of 
the mentum. The knowledge of this fact is important, as there has 
been always a mistake concerning the labium and its palpus. Indeed, 
the upper lip is connected with the head, as usual, by the basal border; 
the front border is free, and sometimes greatly projects, as in Acan- 
thaclisis and Coniopteryx. The mertum is often not separated from 
the head, sometimes merely by a suture, and perhaps not moveable. 
The under lip has retained its original form; it is separated into two 
lobes, taken always for the first joint of the palpus by authors. The 
palpus is only 3-joimted. The maxillary palpus is always wanting. 
The structure of the prothorax is rather remarkable, being divided | 
into three segments, free and articulated together. I believe that | 
these parts should be considered as prescutum and scutellum. 
Brauer calls them intermediate seements. The middle part, the pro- 
thorax, bears the legs; the part between the prothorax and the > 
head is always free, sometimes strongly developed, a real segment, 
and nearly as long as the other parts of the body together, as in 
Nemoptera. The part between the prothorax and mesothorax is even 
fret and separated, and bearing on each side a conspicuous stigma. 
I believe the structure of the prothorax to be a prominent character 
of the larve of the Hemerobina. 
The meso- and metathorax of different form and size, show mostly 
on each side on the dorsal plate a kind of scar, a somewhat hyaline 
spot. ‘This is, without doubt, the place where the wings are to be 
preformed in the interior of the larva. 7 
The legs are remarkable by position and structure. The base be- 
ing always placed as near the side border as possible, the legs are 
very distant from each other. ‘The coxa is strongly developed and 
turned inwards. ‘The tarsus has only one joint, and is sometimes not | 
separated from the tibia. There are two claws, rarely but one, and 
between them, in several genera, a more or less developed pulvillus, 
consisting of plantula and arolium. ‘The abdomen has nine seg- 
ments, decreasing in breadth to the tip. All except the last on each 
side with a stigma; in several genera, the first, or the first and sec- 
ond pair, placed on the dorsal plate of the segment. More or less 
developed lobes, often provided with bristles or hair pencils, are 
placed on the sides of the thorax and the abdomen, strongly recall- 
ing, as stated above, the locomotive organs of the Annulata. 
The last segment of the abdomen is often of a different shape and 
construction, for help in locomotion, or other purposes. One genus, 
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