56 



by Hartig are not admissible. The larvae of D. variegatum and 

 D. fnitetorum were confused by Hartig, who was indeed unable to 

 divide these two species. It should be noted that the larvae of 

 D. variegatum (also placed under D. frutetorum by Hartig) are very 

 like those of D. virens and D. laricis, from which, according to Hartig, 

 they differ in that the darker green dorsal stripe is not divided, or only 

 so on the first two segments. In the case of the larvae bred by the 

 author, a darker green, divided dorsal stripe occurred on the first two ta 

 four segments and then disappeared, the remaining segments being 

 unstriped (contrary to what occurs in D. virens and D. laricis), though, 

 the dark dorsal aorta simulates a dorsal stripe. The larva of D. frute- 

 torum (described by Hartig as that of D. variegatum) is usually included 

 among the smooth-bodied larvae, but in reality it has distinct black 

 spines, which, however, are only visible under a lens. Those who 

 desire more information on the morphology of these saw-flies are 

 referred to the author's work mentioned above and to a paper by him, 

 Die Tenthredinoidea Mitteleuropas I, which appeared as a supplement 

 to the Deutsche Entomologische Zeitschrift, 1912. The keys given, 

 are supplemented by figures and deal with the following species : — D. 

 nemorum, F., D. pallipes, Fall., D. fuscipenne, Forsius,2). serf i/er, Geoff r. 

 D. pallidum; Kl. D. fennicum., Forsius, D. jjolytmnnm, Htg., 1834 

 (hercyniae, Htg., 1837), D. virens, Kl., D. pini, L. {eques, Schrank, 

 dorsatum, F., nemorum, Fall., necF.), D. simile, Htg. {eremdta, Thorns.), 

 D. socium, KL, D. variegatum, Htg. {thomsoni, Knw.), D. abieticola,: 

 D. T. {abietis, R. V. Stein, nee Harris), D. laricis, Jur., D. frutetorum, F. 



Baer (W.). Ueber Nadelholz-Blattwespen. [The Saw-fiies of Coni- 

 ferae.] — Natunvissenschftl. Zeitschr. f. Forst- u. Landwirtschaft, 

 Stuttgart, xiv, nos. 7-8, July-August 1916, pp. 307-325. 5 figs. 

 [Received 1st November 1916.] 



The first section of this paper deals with the Lydids infesting firs,, 

 the known species of which belong to the genus Cephaleia, and are nO' 

 longer included in the genus Lgda, now Acantholyda, which comprises 

 Bpecies infesting the pine, such as A. stellata, A. erythrocephala and 

 A. hieroglyphica {campestris). L. hypotrophica, Htg., has been found 

 to be a synonym of Tenthredo abietis, L., and this j)est should now be 

 known as Cephaleia abietis, L. The genus Cephaleia' comprises six 

 species native to Germany ; two are rarities, and the other four, 

 C. alpina, Kl. {lariciphila, Wachtl), C. erythrogastra, Htg., C. abietis, L., 

 C. arvensis, Pz. {signata, F.) — are of importance in forestry. They 

 are very similar morphologically and a key to them is given. Their 

 biological characteristics are, however, more marked. C. alpina does 

 not live on the fir, but on the larch. Whilst chiefly occurring in 

 Alpine regions, it has followed the larch to new plantations elsewhere. 

 In Austrian Silesia the flight period was noticed at the end of April and 

 early in May, and the damage done became noticeable owing to the 

 larches turning brown early in July. Of the other three species, 

 C. abietis is specially characterised by its gregarious habits in the 

 larval stage. In the case of the two remaining species, C. arvensis 

 and C. erythrogastra, the eggs are laid singly and are usually 

 found on needles of the spring growth and not on those of the 

 preceding year, as are the eggs of C. abietis. These larvae feed mostly 



