506 Miscellaneous. 



Another very remarkablo fact, which has not previously been ob- 

 served, is a difference in the numher of gaiujlia in the same species 

 acfordinfj to the se.v. The workers and the females of Bombus have 

 six abdominal ganglia, while the male has only five ; the working 

 bees have five abdominal ganglia, while the queen and the males 

 liave but four ; the male Megachile has four abdominal ganglia, 

 while the female has five ; the working wasps have five ganglia, 

 the females and the males six. 



The stomato-ijastric si/stem is composed of a frontal ganglion, two 

 angeian ganglia, two trachean ganglia, and a ventricular ganglion. 



II. Nervous Si/stem of the Larvce. — The nervous system of the 

 larvae is very uniform. The larvae have thirteen ganglia, while the 

 cateqiillar of the Lepidoptera has only twelve. The larva? of the 

 Hvmonoptera have eight abdominal ganglia, which are all simple ; 

 in very young larva>, however, the subocsophageal and the last abdo- 

 minal ganglia show traces of the fusion of three embryonic ganglia. 



III. Nervous Sijstcm of the Emhnjo. — The researches of 0. Ilietschli 

 and of A. Kowalewski on the development of the bee have proved 

 that the embryos possess seventeen ganglia — that is to say, one supra- 

 trsopJuu/eal i/anr/Iion, three small sitbcesophageal r/anglia (which unite 

 to form a single suboesophageal ganglion in the larva), three thoracic 

 and ten abdominal ganglia (of which the last three form afterwards 

 the last abdominal ganglion of the larva). 



IV. ^Metamorphoses of the Nervous Sgstem. — The changes which 

 the nervous system undergoes during the metamorphoses of the 

 larva are produced by the fusion of several ganglia. The first 

 thoracic ganglion of the larva remains isolated in the adult insect ; 

 the second and third thoracic ganglia of the larva approach one 

 another more or less, and in some they blend into one medullary 

 mass. The first abdominal ganglion always joins with the last 

 thoracic, so that the adult insect has never more than seven abdo- 

 minal ganglia ; but in most cases the second abdominal ganglion 

 also unites with the last thoracic ganglion. If the number of 

 abdominal ganglia diminishes yet more in the adult insect (5, 4, '.i 

 ganglia), this is effected by the fusion of some ganglia with the last 

 abdominal ganglion. — Coniptes liendus, Sept. 18, 1876, p. 013. 



Chi some remarl-able Species of Mantidoc. By Prof. J. Wood-^Iason. 



These insects belong to that division of the family in which either 

 the legs or some parts of the body are provided with appendages, and 

 to that section of it in which in males as well as in females the 

 antennae are simple and setaceous and not pectinated ; and I invito 

 attention to some sexual differences presented by them which, I 

 believe, have never before been noticed. 



In Hegtias Brunneriami the head of the female is prolonged ver- 

 tically in the fonn of a cone bilobed at its extremity, while in the 

 opposite sex this great cone is represented by a mere tubercle as in 

 both sexes of the species belonging to the genus Creohrota ; the fore 

 femora, which are wanting in the specimen from which the species was 

 described by Saussure, are cijually conspicuous in both sexes, being 

 very broadly oval, with their upper margins very strongly crested. 



