137 



is described by Mr. Westwood in the greatest detail, and with 

 continual references to those portions of the descriptions published 

 by his predecessors, which are either vague, or incorrect, or in which 

 they are contradictory to each other. The principai points which he 

 has endeavoured to elucidate, in addition to the transformations ■vvhich 

 these insects undergo, are the distinction of the sexes, and conse- 

 ąuently the sexual characters and the difFerent organization of the 

 ahdomen in the sexes ; the structure of the mouth, antenn<B, and eyes ; 

 the separation of the metasternum and the abdomen ; the situation and 

 construction of the spiracles ; and the nature of the serrated organs 

 between the base of the anterior and intermediate legs. The sexual 

 distinctions appear especially to have been misunderstood, and the au- 

 thor takes great pains to explain them in each of the species respec- 

 tively vvhich he has been enabled satisfactorily to examine. 



Mr. Westwood concludes his Paper by a Synopsis of the Species 

 of the 



Genus Nycteribia. 

 Ntcteeibia Stkesii. Nyct. rufo-picea, thoracis tegumento dor- 

 sali abdominegue obscur^ albicantibus ; hoc tuberculis minutissi- 

 mis nigris undiąue tecto tuberculis ąuatuor majoribus in guadran- 

 gulo centrali dispositis, segmentis (unico basali excepto) destituto, 

 apiceąue pilis rigidis ferrugineis elongatis obtecto ; pedibtis elon- 

 gatis subcompressis paullb dilatatis, breviter setosis ; femoribus 

 magis ferrugineis, coxis anticis elongatis tibiisgue apicem versus 

 attenuatis ; pectinibus thoracis elongatis ; oculis e tuberculis qua- 

 tuor compositis. ( C ) 

 Long. corp. lin. 2^. — Species maxima. 

 Hab. in India Orientali. — In Mus. D. Sykes. 



Nycteribia Hopei. Nyct. abdomine concolore nitido, in medio 

 obsoleti 5-articulato, ovato-conico-depresso, segmento ultimo co- 

 nico-truncato, apice lateraliter setigero subtus stylis duobus conico- 

 elongatis inflexis armato. ((į) 

 Long. corp. lin. 2. — Prsecedenti valdė affinis, at minor. An 



illius mas ."" 



Hab. in India Orientali, apud Bengaliam. — In Mus. D. Hope. 



Nyctehibia dubia. Nyct. fusco-castanea, pedibus magis casta- 

 neis ; coxis anticis elongato-conicis, femoribus tibiisgue subcylin- 

 dricis; thorace subtiis irregulariter rugoso ; pectinibus thoracis 

 lateralibus elongatis ; abdomine (" $ " Latr. ^ ?) ovato, 6-annu- 

 lato, segmento postico conico-elongato postice attenuato et ti-uncaio. 

 Long. corp. circiter lin. 2., Latr. 

 Nycteribia Blainvillii, Latr., in Nouv. Dict. d'Hist. Nat., tom. xxiii. 

 nec Leach, 



Hab. in Insulsl Isle de France dict&. Latr. — India ? — In Mus. oUm 

 Latreille. 



The alleged diversity of sex, the difFerence of habitat, and the 

 nearly cylindrical legs, induce the belief that this species is distinct 

 from the lašt, with which hovvever it ofFers a close resemblance both 

 specifically and sexually. 



