64 ENTOMOLOGY. 



the body is flattened, and the head extended horizontally. 

 The pronotum is large, broad, and more or less square; the 



Nitsch, C. L. Die Familien und Gattungen der Thierinsekten 



(Germar's Mag. d. Ent., iii., 1812). 



Insecta epizoa (Leipzig, 1874. Edited by Giebel). 

 Packard, A. S. On the systematic position of the Mallophagc 



(Proc. Auier. Phil Soc., xxiv., 1887, p. 264). 

 Piaget. Les Pediculines (Leyden, 1880). 



b. Perlidae (Plecopterd). 



Gerstaecker, A. Ueber das Vorkommen von Tracheenkiemen bei 

 ausgebildeten Insekteu (Zeits. f. Wissen. Zool., xxiv., 1874). 



Hagen, H. A. Synopsis of N. A. Neuroptera. 



Newport, G. On the anatomy and affinities of Pteronarcys regains 

 (Trans. Linn. Soc., London, xx., 1851). 



Packard, A. S. (External anatomy of Pteronarcys, in third report 

 U. S. Ent. Commission, 1883, p. 322, Pis. XI, XLIV, LVII). 



Pictet, F. Histoire naturelle, etc., des insectes Neuropteres : Part 

 I., Perlides; Part II., Ephemerines. (Geneve, 1841-45. With col- 

 ored plates.) 



c. Psocidse (Corrodentia in part). 



Burgess, E. The anatomy of the head, and the structure of the 



maxilla, in the Psocidse (Proc. Bost. Soc. Nat. Hist., xix., 1878, 



291). 



Hagen, H. A. Synopsis of N. A. Neuroptera. 

 Beitrage zur Monographic der Psocideu (Stettin Ent. Zeit., 



1882). 

 Nitzsch, C. L. Ueber die Eingeweide der Bftcherlaus, Psocuspulsa- 



torius (Germar's Mag. d. Eut., iv., 276). 

 Packard, A. S. (External anatomy of Psocus, in third report U. S. 



Ent, Commission, 1883, p. 325, Pis. XXXIX, XLIII). 



d. Embidae. 



Hagen, H. A. Monograph of the Embidiua (Canadian Ent,, xvii., 



1885). 

 Westwood, J. 0. Characters of Embia, a genus of insects allied to 



the white ants (Trans. Linn. Soc., xvii., 369). 



See also the writings of McLachlau, Wood-Mason, etc. 



e. Termitidse (Corrodentia in part). 



Hagen, H. A. Monographic der Termiten (Linuaea Entomolog., x., 

 xii., and xiv.). 



Miiller, F. Beitrage zur Kenutniss der Termiten (Jena. Nat. 

 Zeitsch., vii., 1873). 



Packard, A. S. (External anatomj r , in third report U. S. Ent. Com- 

 mission, 1883, p. 326, Pis. XXXIX-XLIII). 



Smeathman, H. Some account of the Termites, which are found in 

 Africa and other hot climates (Phil. Trans., Ixxi., 1781. London). 



