ME. a. BKOOK ON A J!^EW GENUS OE COLLEMBOLA. 



5J.5 



Darker intermediate forms occur, more or less spotted and 

 patched witli a fulvous brown. The type is of a iiuiform fulvous 

 brown colour, excepting the central portion of the posterior 

 part of the mesothorax and the metathorax, and the upper central 

 portion of the first abdominal segment. The third segment of 

 the antenuEe is often fulvous. 



The following are a series of approximate measurements of a 

 full-grown individual : — 



inch. 



Length of body ^ 



„ abdom. & thorax ^r 



head. 



inch. 



Length of spring ^V 



Width of 3rd abdom. segm. -gV 



„ head ^ 



antennae ^ 



This species is rather active, and seems to live well in confine- 

 ment. Eggs were laid early in January, apparently singly. They 

 were spherical, white, and not very shining, faintly and widely 

 wrinkled. A depression with a raised rim round it occurs at both 

 ends, as figured by Nicolet. 



On January 23rd a young, apparently recently hatched indi- 

 vidual was observed. The head was large and slightly broader 

 than the thorax. Antennae large, with first three segments siib- 

 globular ; fourth joint thick and fusiform, nearly as long as the 

 other three together. Spring reaching the ventral tube. Colour 

 white, with two distinct eye-spots on each side. 



Fig. 3. 



A. Olubbecl hair from Ihorax of S. curviseta, X about 120. B. Spring of 

 Sinella, vertical view, showing the division of the dentes into three parts, one of 

 which bears the mucrones, X 200. C. Clubbed hairs from sixth abdominal 

 segment of Sinella, X about 150 ; these are usuaEy bent under the abdomen. 

 From enlarged photographs and mounted specimens. 



LINN. JOUEN. — ZOOLOGY, VOL. XVI 



41 



