Entomological Works. 379 



toria, parasitica, cudijicatoria, plant ivora, et singulam harum 

 serierum (ad habitum) cum proxima per series subditas 

 minores connecti sive cohaerere." He, however, does not 

 object to the insertion of the parasitic bees, sand-wasps, &c, 

 amongst the working species of those tribes ; thus, Dolichurus 

 and Ceropales are arranged amongst the Pompili, Nysson 

 with Mellinus, Figites with Cynips, and Hylae N us and Psithyrus 

 amongst the Mellifica, &c. The classification here proposed 

 is evidently the result of much study, and will amply repay 

 investigation. The second part of the work gives us a de- 

 tailed tabular view of the structure and habits of the eruciform 

 hymenopterous larvae found in Scandinavia ; and the third 

 part is occupied by very copious descriptions of these larvae, 

 and is a most valuable addition to our knowledge of the 

 order. 



The second work of Dr. Dahlbom may be considered as 

 supplementary to the preceding. It is devoted to the illustra- 

 tion of the Hymenoptera Plantivora, comprising the families 

 Tenthredinides, Xiphiurides, Suicides, Oryssini, and Cynip- 

 seae. A very elaborate and useful historical revision of the 

 Tenthredinidae is given, together with the characters, natural 

 history, geographical distribution, &c, of that family (a portion 

 of which is illustrated in the present fascicle), together with a 

 tabular view of its genera, which are 15 in number; Cimbex, 

 Athalia, Hylotoma, Cyphona, Lophyrus, Monoctenus, Cla- 

 dius, Priophorus, Nematus, Tenthredo, Dineiira, E'mphytus, 

 Dolerus, Phyllotoma, and Lyda. Many new species are de- 

 scribed ; but the author is not acquainted with the uncompleted 

 volume of Mr. Stephens's Illustrations containing this family. 



Mr. Shuckard's Essay is one of the most valuable works 

 which have appeared in this country since the Mo?wgrap/iia 

 Apnm AnglicB and the Hora? Entomological. Personally ac- 

 quainted with the author, we can bear ample testimony to the 

 unwearied zeal with which he got together his materials, not only 

 of insects, but of careful examination of the works of his pre- 

 decessors. In an introduction, of 25 pages, the author gives 

 us some general observations upon the structure and economy 

 of the insects in question, from which we extract the followino- 

 passage, as bearing upon the principle of classification noticed 

 above, in the works of Saint Fargeau and Dahlbom : — " With 

 respect to the apparent anomaly of parasites being of the 

 same order, or perhaps of the same genus [as the workino- 

 species], it may be remarked that these are not internal para- 

 sites, and that, perhaps, a greater resemblance was necessary 

 between the individuals than in the case of internal parasites, 

 which, I believe, are destroyers of eggs and larvae exclusivelv ; 



