TRIBE III. CORTHYLINI. 64] 



loosely packed with chips on which ambrosia begins to grow. As 

 the young larva 1 eat and grow, they deepen their cradles, swal- 

 lowing but not digesting the wood. The excrement, yellow- 

 stained, is cast out of the mouth of the borings by the mother, a 

 portion being utilized to form the fungus bed. The ambrosia of 

 Moiiariliruin is moniliform. resembling a mass of pearly beads; 

 the base has a tinge of green, but the stain in the wood is almost 

 black. The two species are commonly associated in the same 

 trunk, attacking hickory, beech, maple, aspen, apple and orange. 

 They enter the green sap and heart wood of logs, stumps and 

 dying and dead trees, causing round black holes called "pin- 

 holes," and discolorations termed ''bluing." 



1033 (9055). MONAETIIRUM FASCIATUM Say, 1825, 255; ibid. II, 318. 



Elongate-cylindrical. Piceous, antennae and legs ferruginous-yellow; 

 elytra yellow in front, black behind, black color commonly extending 

 forward along the suture. Prothorax longer than wide, tuberculate and 

 slightly hairy in front. Elytra very finely punctate-striate, glabrous and 

 shining, at tip obliquely truncate and thickly clothed with yellow hairs; 

 margin of declivity acute and a small tubercle near suture in male. Front 

 femora toothed at tip; outer surface of front tibise with teeth-like trans- 

 verse ridges. Female, antennal club fringed with very long hairs; pos- 

 terior declivity of elytra slightly concave near suture, with one small 

 tubercle; front with five punctures and a depression. Male antennal club 

 with only a few shorter marginal hairs; declivity of elytra more strongly 

 margined near tip, tubercle replaced by a long elevation, parallel with 

 suture, slightly cuspidate in front; front with coarse punctures. Length 

 2.53 mm. (Fig. 147, A.) 



Taken frequently throughout Indiana on freshly cut beech 

 logs and by beating; April 10 Oct. 1. Philadelphia Co., Pa., 

 April 25, on beech. (Wenzel.) Ranges from Quebec and Lake 

 Superior to Florida. Occurs on many trees, deciduous and con 

 iferous ; Hicoria, Fac/ns. Qucrcus, etc.; also bores in wine casks. 



P. gracile is separated by Eichhoff (and recognized by Swaine) on 

 account of luteous color of elytra and finer punctuation of head, which 

 is also longitudinally impressed. 



1034 (9058). MONABTHBXTM MALI Fitch, II, 1855, No. 5. 



Brown, base of thorax and elytra paler; antennae and feet ferrugin- 

 ous-yellow. Very similar to fasciat-us, but smaller, with the rows of punc- 

 tures of elytra scarcely visible; the oblique truncation of the tip is gla- 

 brous and there are two small teeth near the suture. Length 2 mm. 

 (Fig. 147, B.) 



Jackson, Gibson and Posey counties, Ind., scarce; May 4 

 July 10. Ormond and Dunedin, Fla.; Jan. 15 April 14. Bronx, 



