286 BIBLIOGRAPHICAL NOTICE. 



Fam. III. LIOTHEIDJ2, Burmeister. 



Synonym. Orthopterae pizoica, Nitzsch. Nirmidse, Leach. 



Essent. Char. Antennse capitate, four jointed ; maxillary palpi con- 

 spicuous ; mouth with strong mandibles. 



Nat. Char. Mouth beneath, very near to the anterior margin ; man- 

 dibles strong, armed at the end with two teeth ; antennae inserted in a 

 cavity of the lateral margin ; thorax of two or three segments ; pro- 

 thorax with the lateral margins protruding more or less, nearly the 

 width of the head ; mesothorax generally small, in some cases as wide 

 as the head ; metathorax large, the width of the abdomen ; abdomen 

 with nine or ten segments; oesophagus symmetrical, equal, slightly uni- 

 lateral ; biliary vessels four, free, thickened in the middle. Males with 

 three testicles on each side ; females with three ovaries. Coitus exer- 

 cetur femina mari submissa. Metamorphosis indistinct. 



Artificial Divisions of the Family. 



Genus. Sub-genus. 



I. Colpocephalum, (12 species.) 

 II. Menopon, (22 species.) 



I. Tarsi with 2 



LcUSl W1U1 4B L T T 



claws. L LlOTHEUM 



II. Tarsi with 



\ \ 



1 claw. J IL GYROPUS > ( 2 species.) 



III, Nitzschia, (nova, 1 species.) 



IV. Trinoton, (4 species.) 

 V. Eureum, (2 species.) 



VI. Lamobothrium, (5 species.) 

 VII. Physostomum (o species.) 



The only new genus which the author has added in the work, occurs 

 in the last family, viz., NITZSCHIA We extract the characters for the 

 sake of reference : 



Sub-genus III. NITZSCHIA, Denny. 



Synonym. Nitzschia, Denny's MSS. Menopon, Nitzsch. 



Sub-gen. Char. Head oblong, triangular, orbital margin sinuated ; 

 maxillary palpi large and prominent; antenna capitate, nearly concealed; 

 prothorax narrow ; mesothorax large, very distinct ; abdomen oblong ; 

 tarsi with large involute pulvilli, 



Spec. Nitzschia Burmeisteri. Denny (Louse of the common Swift.) 

 Menopon pulicare, Nitzsch, MSS. 



The new species figured and described amount to 93, and the num- 

 ber of the illustrations of the Order 205, with, in most instances, nume- 

 rous representations of isolated portions of each species. 



The work has been got up with great care. With regard to the 

 figures we can speak as to the accuracy of their outline and delicacy of 

 their execution. 



