PCECILOSOMA PULVERATUM. 211 



3. P(ECILOSOMA PULVERATUM. 



Plate II, figs. 2 and 2a, larva ; Plate XX, fig. 8, Saw. 



Tcnthredo pulveratum, Rctz., Degeer, 304; De Geer, Mem., ii, 



291, t. 34, figs. 2025 (lar.) ; 

 Fall., Acta, 1808, 105, 38 ; Dbm., 

 Claris, 34, 53. 



olesa, Klug, Berl. Mag., viii, 164; Htg., Blattw., 

 302, 13 (Poecilosoma), Brischke, 

 Beschr., 5, t. i, fig. 1 (lar.). 

 leucozonias, Htg., Blattw., 290, 15. 



AUantus leucozonias, Rudow, S. E. Z., 1871, 137. 



Poecilosoma pulveratum, Thorns., Op., 288, 1 ; Hym. Sc., i, 229, 



2; Cam., E. M. M., xv, 12; 

 Fauna, 19, 1; Voll., Tidj. Ent., 

 xxiii, 7, pi. 2 (lar., &c.) ; Andre, 

 Species, i, 332, pi. xx, figs. 4, 6, 

 8 (lar.); Cat., 42,* 3; cf. also 

 Bergman, Wet. Acad. Handl., 

 1763, 161. 



Black, sinning, smooth, covered with a close greyish pubescence ; 

 tegulee, edge of pronotum and the abdominal segments at their junc- 

 ture, white. Legs and apex of abdomen reddish-ochreous. Wings 

 hyaline; costa and stigma sordid testaceous; nervures black at the 

 apex, pale at the base ; saw projecting, the sheath black ; cerci small ; 

 posterior tarsi fuscous ; palpi fuscous. 

 Ab. a. Abdominal segments without white bands. 

 b. Labrurn white. 

 ., c. Anal segment black. 



c?. Apex of posterior femora and tibia? and tarsi fuscous. 

 Length 3 4 lines. 



The <$ of this insect has never been discovered, and 

 there is good reason for believing that parthenogenesis 

 plays a normal role with it. This is shown by the fol- 

 lowing observation. Early in May I found in one of 

 my breeding bottles two ? specimens, one dead, the 

 other apparently but newly emerged, and there was 

 no trace of a male. The living specimen was taken 

 out of the bottle and placed under a bell glass along 

 with a fresh sprig of alder. In a short time it layed a 

 number of eggs, most of which produced Iarva3, thus 

 showing conclusively that the insect can propagate 

 without having connection with the male. 



The manner of oviposition was as follows : Until 



