152 GEO. H. HORN, M. D. 



ABJDRECTOR, n. g. (Chrysomelidse). 



Form elongate oval, as in Diabrotica 12-punctuta. Surface gla- 

 brous. Head short, eyes round, prominent. Front vertical with very 

 deep transverse fossa below the eyes, above which is a short very 

 prominent transverse plate emarginate on its free edge. Labium 

 transverse, emarginate. Antennae moderately long, equal to two- 

 thirds the body, first joint long, slender, sec- 

 ^~*r~-£^(^>~&^fy<. ond short, scarcely one-fourth as long as the 

 * \\ first, third joint as long as the first, broadly 



\) dilated at distal end and deeply emarginate 

 in front, fourth joint half as long as the third, 

 broadly dilated at distal end and deeply notched, joints 5 — 11 slender, 

 of usual form and gradually increasing in length, the last joint acute 

 at tip, these joints together one-third longer than joints 1 — 4. An- 

 terior coxae contiguous. Tarsal claws with broad basal dilatation. 



This genus is proposed for a Chrysomelide of the tribe Galerucini, 

 allied to (Jerofoma, from which it differs in the deformity of the third 

 and fourth antennal joints, the vertical and deeply excavated front. 

 The frontal excavation is deep, extending from one side of the head to 

 the other and slightly divided at middle by a slight ridge, the ridge 

 forming the lower margin of the fossa is moderately prominent at its 

 extremities and with a small tubercle at middle; above the fossa and 

 forming its upper boundary at middle, is a short plate projecting at 

 right angles to the front and emarginate on its free edge. The form 

 of the antennae is represented in the accompanying diagram and as the 

 specimen is a male and the articulation between the third and fourth 

 joints freely movable, it is probable that this structure has similar uses, 

 to that for which the deformed joints of the male antennae of Collops 

 are applied, that is for holding the antennae of the female in copu- 

 lation. In every other respect the insect is a Cerotoma. 



A. sexpunctatus, n. sp. — Pale yellow, glabrous, shining; elytra with 

 a humeral, median and subapical small black spot on each side. Head 

 pale yellow, occiput slightly darker, antennae pale yellow. Thorax similaF in 

 form to Cerotoma caminea, smooth, sparsely punctured. Elytra oblong, broader 

 behind the middle, shining, with three small black spots externally, surface 

 sparsely and irregularly punctured. Scutellum piceous. Body beneath pale 

 yellow, hind coxse and sides of pectus piceous. Legs pale yellow, hind femora 

 tipped with piceous. Length .22 inch; 5.5 mm. 



One male from Texas. Less robust than Cerotoma caminea and 

 similar in form to the spotted species of Diabrotica. 



