The Development of Phryganids, with a Pre- 

 liminary Note on the Development of Blatta 

 Germanica. 



By 



fVilliam Patten, 



Of Boston, U.S.A. 



With Plates XXXVIa, XXXVIb, and XXXVIc. 



I. General Eemarks. 



The^ eggs of this insect (Neophalax concinnus) were 

 obtained in great quantities from the muddy bottom of a 

 slow running stream in the neighbourhood of Boston, Mas- 

 sachusetts. About 150 eggs are embedded in a spherical, 

 vesiculated, semi-transparent mass of gelatinous substance, 

 which either lies freely on the top of the mud, or is more or 

 less covered by it according to the length of time it has been 

 deposited. Very rarely it is attached to some stick or stone. 



The eggs are found in the greatest abundance in water four 

 or five inches deep, and where there are a great many twigs 

 lying on the bottom and projecting above the surface. These 

 twigs would undoubtedly afford an opportunity for the females 

 to crawl below the water and deposit their eggs in the manner 

 described by McLachlan." P have never seen them myself 



^ A part of the following investigations were carried on under the direction 

 of Ur. E. L. Mark, at the Museum of Comparative Zoology at Harvard 

 University, Cambridge, Mass., the remainder under the instruction of Professor 

 R. Leuckart in tlie Zoological Laboratory at Leipzig. 



^ * Monographic Revision and Synopsis of the Trichoptera of the European 

 Eauna,' Robert McLachlau, 2 vol., 187i— 80. 



* The following description applies to Phryganids unless otherwise stated. 



VOL. XXIV. NEW SER. P P 



