REVIEWS. 51 



ful and complete. The other essays, which we have coupled with it, having 

 been chiefly incorporated in this comprehensive work, we shall have little 

 occasion to review them individually, but some notice of them seemed ne- 

 cessary towards a general summary of the contributions to the literature of 

 the order, which have proceeded from this quarter, since the last addi- 

 tions were engrafted on the system by Meigen. 



St&ger commenced, in 1838, publishing a catalogue of the Diptera of 

 Denmark, in Kroyer's N. H. Journal, with descriptions of the new species 

 only, of which the number was not inconsiderable. We owe to him the 

 institution of two new genera, Ptiolina and Boletina. Having gone 

 through the Nemocera on this plan, and commenced a Monograph of the 

 Dolichopidce, of which only the species of Dolichopus, Sybistroma, and 

 Orthochile were given in detail, he transferred the materials for the rest 

 to the behoof of Zetterstedt's work, which his communications chiefly 

 have rendered a Fauna for both countries. 



Stenhanimar has produced a very accurate and complete description of 

 the Ephydrini of Sweden, the number of which he has much more than 

 doubled. His generic arrangement deserves the highest praise, and the 

 changes which Zetterstedt has made, while adopting it in the main, cannot be 

 called improvements. His careful delineation also of the external anatomy 

 of these insects has both laid the grounds for a better characteristic of the 

 genera and species, and supplied materials for a more precise glossary of 

 the parts. We think the term prcelabrum, which he has introduced, su- 

 perfluous, the part denoted corresponding to the epistoma in other orders, 

 where it is separated by a distinct suture from the hypostoma or face. We 

 gladly look for a promised Monograph of the Sphaerocerini from the same 

 pen, expecting that an enlarged acquaintance with the literature of Ento- 

 mology will exclude from it such nominally new, but, in fact, previously- 

 described, species and genera, as have gone to swell the synonyms among 

 the Ephydrini. 



Of the shorter essays in the Transactions and Proceedings of the 

 Swedish Academy, in which many species have been described originally, 

 those by Wahlberg are the most important, as containing the characters of 

 several new genera, Thinophilus, Psairoptera, Amphipogon, Lobioptera, 

 Selachops. 



Zetterstedt's earlier work, INSECTA LAPPONICA, opens with a very in- 

 teresting sketch of the distribution of insects on the several stages of 

 ascent of the Lappish Alps. The outline, drawn with a masterly hand by 

 Heer, " On the Highest Limits of Animal and Vegetable Life on the 

 Swiss Alps" has since been filled up, in part, for the zones -of the Alps, the 



