TRIBE I. CRYPHALIXI. G17 



fungus, consisting of short, erect stems, terminating in spherical 

 conidia. (Fig. 146.) Freshly grown it is colorless but usually 

 greenish-yellow, resembling sublimed sulphur. The brood cham- 

 ber is packed at times with eggs, larvae, pupae and adults. The 

 larvae aid in extending the chamber, the wood passing through 

 their bodies becoming mustard-yellow in color; great quantities 

 of this excrement are ejected from the openings to the colony, 

 but a portion is retained to form a bed for new crops of food 

 fungus. Sometimes the remains of deceased members are found 

 in a deep recess, with the mutilated remains of predatory beetles. 

 This species feeds only in dying trees and generally trunks of 

 large size. Oak, hickory, beech and maple seem to be preferred. 

 It does much injury to timber, and in cut lumber the broad, flat 

 chambers produce defects that cannot be remedied by plugging. 



983 ( -). XYLEBOKUS TECANIS Hopkins, 1915-a, 63. 



Oblong-elliptical. Dark reddish-brown. Pronotum with sides parallel, 

 rugosities fine, with small, shining, median elevation and posterior dor- 

 sal and lateral areas smooth, shining, glabrous. Front broad, subconvex, 

 opaque, alutaceous, with distinct median line. Elytra shining, with 

 strial punctures fine, in distinct rows; interspaces smooth and shining; 

 declivity opaque, subconvex, with interspaces 1 and 3 not elevated, but 

 with rows of granules, 2 flat, but not impressed and without punctures, 

 posterior lateral margins scarcely serrate. Male, light brown. Pronotum 

 subconvex, anterior area not impressed, with very fine rugosities; body 

 sparsely clothed with erect hairs; front narrow, subopaque. Elytra 

 shining, faintly punctured, declivity oblique; interspaces 1 and 3 faintly 

 elevated, 2 faintly impressed, granules very small. Length, female, 1.9 

 mm.; male, 1.5 mm. 



Waynesboro, Mississippi, in Hicoria pecan Marsh. 



984 ( ). XYLEBORUS FLORIDEXSIS Hopkins, 1915-a, 63. 



Oblong-elliptical. Yellowish-brown. Prouotuni with sides parallel, 

 anterior rugosities fine, with faint dorsal tubercle, median and posterior 

 dorsal areas subopaque, lateral area alutaceous. Front subconvex, aluta- 

 ceous, with faint median line. Elytra with stria? impressed on dorsal area, 

 punctures coarse; interspaces smooth and shining, faintly punctured; 

 declivity subconvex, interspaces 1 and 3 distinctly elevated, 2 impressed, 

 with strial punctures distinct, posterior lateral margin serrate. Length, 

 female, 2.3 mm. 



Enterprise, Florida, May. (Hul)ltard & Schivarz.) 



985 (9115). XYLEBORUS PLAXICOLLIS Zirnrn., 1868, 145. 



Ferruginous; front smooth and flat. Prothorax almost as wide as 

 long, very finely and thickly punctured, not roughened in front out broadly 

 flattened; disc feebly and broadly sulcate and clothed on anterior half 



