1881. 271 



fourth segment (the first abdominal) black ; the fifth yellow ; the sixth yellow, mar- 

 gined with black, with an irregular black band running transversely across it, and 

 extending on the under-surface so as to form almost a complete ring round the body ; 

 seventh segment black. There is also a lateral black line along the first two segments. 

 The antennae are twice the length of the head ; the first and second joints yellowish, 

 the third and fourth purplish, the articulations of the second and third are black. 

 . The legs are white, with black articulations. The spring white. 



This insect is undoubtedly near D. muscorum, Nic, but is 

 distinguished by the shorter antennae, the black articulations of the 

 antennae and limbs, and the greater preponderance of black over the 

 whole body. 



The markings in the whole genus Degeeria are fundamentally the 

 same, at least, in the yellow species, the great difference being caused 

 by the variability in breadth of the black bands which margin the 

 body-segments ; this species has broader black bands than any other 

 with which I am acquainted, which give it the appearance of 

 being regularly banded with alternate black and yellow. The amount 

 of black also varies in this species, apparently according to age ; for, 

 in a smaller and presumably younger specimen, the fifth segment is 

 yellow margined with black, while in the adults, the black has extended 

 entirely over the segment, leaving only a trace of the yellow, and in 

 the younger specimen again, the articulations of the feet and the an- 

 tennae are rather grey than black. It is certainly the prettiest species 

 that I have as yet seen. 



20, Portsea Place, Connaught Square : 

 April, 1881. 



ON PARTHENOGENESIS IN THE TENTHREDINID^. 

 BY P. CAMEEON. 



My observations last year have enabled me to add two species to 

 the list of parthenogenetic Tentliredinidce ; and to prove the occurrence 

 of complete parthenogenesis in Poscilosoma pulveratum and Eriocampa 

 \ovata. 



A virgin $ of Nematus pavidus, Lep., laid a few eggs from which 

 [ obtained two males. 



A specimen of Taxonus glabratus, Fall, (agilis, Kl.), bred from 

 arvae which fed up at the end of July, laid eight eggs, which were 

 certainly fertile, but the larvae perished in the eggs, owing to the food- 



[lant drying up. 

 Five Pcecilosoma pulveratum laid in June from five to eleven eggs 

 ach, but out of that number only two larvae became full-fed. On 



