THE CANADIAN ENTOMOLOGIST. 29 



Imago $- (fig. 6): Length, 1.66-2 mm.; width (dorsal) .86-.88mm.; 

 easily distinguished by its general resemblance to the female, its small size, 

 slightly flattened and bent form. 



Gallei'ies (Plate 3, fig. i) : Width of entrance on primary galleries, 

 .8-.9 mm.; width of brood-chambers from i to 20 mm.; length, 1-7 mm.; 

 diameter, .9-1.1 mm. 



ExphtJiation of Plates. 



Plate 2. — I. Egg X 25 diameters. 2. Larva, ist stage, x 25 diam- 

 eters. 3. Matured larva X 12^2 diameters. 4. Pupa x i2)4. 5. Imago 

 9x15. 6. (^ X 15. 7. Elytral declivity x 25. 8. Mouth-parts of larvae 

 X 100. 9. Antenna x 100. 10. Labium x 100. 11. Maxilla x 100. 

 12. Front tibia x 100. 13. Tarsus x 100. 14. Genitalia x 50. 



Plate 3. — I. Entrance gallery and brood-chambers in transverse 

 section : a, gallery of Stetioscelis brevis, Bok., utilized by X. xylographiis ; 

 b ist, c second, d third, brood-chambers ; e, incompleted exit gallery ; f, 

 branching gallery evidenly for a fourth brood-chamber; g, dead and partly 

 dried wood : h, living bark ; i, living sapwood ; j, heartwood ; slightly 

 curved transverse lines represent annual growths of wood. 



2. Same as fig. i in vertical section; 2 b, ist brood-chamber, showing 

 death or garbage chamber at b b.; 3 and 4, transverse and vertical view 

 of set of brood-chambers all in living and partly living wood ; 5 and 6, 

 entrance in dead wood, brood-chamber in living wood; 7, primary gallery 

 with two egg chambers ; 8, egg chamber enlarged ; 9, female sentinels as 

 found at «rt, fig. 2 ; 10, ambrosia fungus. All original and from fresh or 

 living material except 10, which is after Hubbard. 



2, mzXe—Bostricluis saxeseiii, Wiesrri., 1846, Stett., Ent. Zeit,, p. 24. 

 Bost7-uhus decolor, Boield, 1859, Ann .^oc Ent. Fr. , p, 479. 

 Xyleborits aescuii, Ferrari (1867?), Barkenk , p. 22. 

 Xyleboriis snbdepressiis. Key , Rev. d'Ento. par Fauv. 2, 142. 

 Xyleborus xylograplius, Hopk,, 1894, Can. Ent., vol. XXVI , p. 279. 



PANURGINUS CLYPEATUS. 

 In Can AD. Entom., 1897, p. 290, I referred the Calliopsis clypeatus, 

 Cresson, to Pamtrgimis. I had considered it probable that Panurgus 

 clypeatus, Eversmann, 1852, was really a Parmrginus, but was not suffi- 

 ciently sure to venture upon changing the name of our insect. There has 

 just come to hand, however, an excellent little monograph of the 

 palgearctic species of Panurgiiius, by Mr. H. Friese, and on p. 19 the 

 Eversmann species is definitely referred to that genus. P. clypeatus 

 (Cress.) may therefore be called P. cressoniellus, n. n. 



Mesilla Park, N. M., Jan. 11, 1898. T. D. A. Cockerell. 



