THE GENUS DENDEOCTONUS. 



145 



curved and somewhat irregular, sometimes doubly inflected and 

 from 12 to 20 cm. long. The female here deposits from 20 to 25 

 eggs in several places. The larvae eat very close together, growing 

 equally in size and age and making a common cavity underneath 

 the bark. In order to go through the pupal stage, they return to 

 the large space which they left behind them and which is now filled 

 with excrement and resin. Departing from their common cavity, 

 they eat out isolated galleries, and at the end of these they pupate. 



Fig. 8S.—Dendroctonus micans: Egg galleries and larval chamber. ^, Basal sections of egg galleries; B, 

 advanced stage of work; a, entrance burrow; b, excavated July 8-16; c, excavated July 8-29; d, eight 

 days old; e, three weeks old; /, basal section; g, boring-dust; h, subsequent or inner gallery ("mother 

 gallery"); i,egg nest with eggs scattered about in boring-dust; fc, social chamber excavated by larvas; 

 I, boring-dust and resin; m, larvae at work. (Adapted from Pauly Forstlich-natur wissenschaftliche 

 Zeitschrift, I Jahrgang, figs. 3 and 4.) 



Distribution (fig. 89). — According to the literature, this species 

 ranges from central to northern Europe and from Denmark and 

 Russia eastward into Siberia. 



Host trees. — It is said to infest Pinus, Picea, Ahies, and Larix. 



Identified specimens. — The writer has examined 1 specimen received 

 from W. Eichhoff, 8 from B. W. Schlick, Denmark; 2 with specimens 

 of work from Reitter's collection, collected in Bohemia, and about 70 

 specimens of adults, as well as larvae and specimens of work from 

 Dr. G. Severin, of the Musee Royale d'Histoire Naturelle, Brussels,, 

 Belgium. 



79980—09- 



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