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. 
Stseger 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. 
Stenhammar has produced a very accurate and complete description of 
the Epliydrini 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 Sphcerocerini 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 Epliydrini. 
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, Ixsecta 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, 11 On the Highest Limits of Animal and Vegetable Life on the 
Swiss Alpsf has since been filled up, in part, for the zones of the Alps, the 
