NEW MALLOPHAGA. 45 



jejunus to be a long delicate tube with expanded, turnip- 

 like, posterior extremity. The " wing -muscles " are 

 greatly reduced. There are but four openings for the 

 ingress of the blood, which is not rich in white corpuscles. 

 Wedl was able to study the heart of Mentrpon pallidum, 

 but Grosse could not succeed in making preparations 

 showing the heart of Tetrao-pthalmus chilensis \y=Meno-pon 

 titan]. 



Respiratory System (fig. 6, plate ii). In Menojyon titan 

 I have found six pairs of abdominal spiracles (segments 

 3-8) and a pair of prothoracic spiracles. There are two 

 large longitudinal trunks and one large transversal trunk 

 (segment 4 of the abdomen) in titan. 



Nervous System (fig. 3, plate ii). There are two head 

 ganglia, the supra-cesophageal and the infra-cesophageal, 

 and three thoracic ganglia lying close together. There 

 are no abdominal ganglia, the hindmost thoracic ganglion 

 sending back into the abdomen two large nerves, whose 

 branches provide the abdominal viscera with nerves. 



Life-History and Habits. 



The Mallophaga have an incomplete metamorphosis. 

 The eggs are elongate-oval, are fastened singly by some 

 gluey substance to the vanes or barbs of the feathers, and 

 the young issue by breaking off a circular cap or lid at 

 the larger free end of the egg. The duration of the egg 

 stage has not been determined for any species. A num- 

 ber of eggs of Nitzschia puiicare (host, the Chimney 

 Swift, Ckcetura pelasgia), collected by P. H. Rolfs 

 (Ames, Iowa), and kept, some of them, " in a tight paste- 

 board box in his vest-pocket, the others enclosed in cot- 

 ton-plugged tubes under a setting hen," incubated under 

 these circumstances in from 13 to 20 days. The age of 

 the eggs at time of collecting was not known. The young 



