Horn.] 4x)U [ Sep . 19) 



O. myrmex Hbst. Kafer, VII, p. 56, pi. 09, fig. 7 ; myrmecodes Say, 

 Care. N. A. p. 15 ; Ann. Ent. ed. Lee. I, p. 278 ; americanus Cliev. Ann. 

 Ent. Soe. N. 1832, p. 105, pi. 3. fig, 3 ; Gyll. Schoa, Gen. Cure. Ill, p. 

 3G6; Rosensch. loc. cit. VII, 2, p. 205. 



Body oblong, slightly compressed, black, shining. Rostrum cylindrical, 

 at base moderately punctured, sulcate, two sulci on the upper surface 

 short, basal, between them a slight carina, on each side a longer sulcus 

 extending from opposite the insertion of the antennas to base. Head very 

 coarsely but sparsely punctured. Thorax obovate, strongly convex, 

 sides arcuate, base narrowed, surface smooth at the sides, coarsely punc- 

 tured along the middle especially toward the apex and base, and with 

 sparsely placed black, suberect hairs, pointing anteriorly. Scutellum small 

 with white pubescence. Elytra oblong, broader at apical fourth, convex, 

 slightly compressed, humeri slightly oblique, surface shining with rows 

 of moderate punctures replacing the strke, intervals with a series of finer, 

 distant punctures each bearing a short erect hair. Body beneath black 

 shining, with a narrow line at the sides of moderately dense cinereous 

 pubescence extending to the tip of the abdomen, pectus smooth, abdomen 

 sparsely punctured. Legs black, sparsely pubescent with cinereous. 

 Femora with a large, triangular, acute tooth, tibise slightly broader below 

 the middle. Length .16-. 18 inch ; 4-4.5 mm. 



This species is known in all collections as scrobicollis, and while it is 

 undoubtedly the americanus it is none the less myrmex, and it is remark- 

 able that no author, Say excepted, has recognized this fact. The large 

 tooth of the femora at once fixes this as the insect intended by all the 

 authors above cited. 



Occurs from Pennsylvania westward and to Georgia. 



O. scrobicolli.3 Boh. Schou. Gen. Cure. VII, 2. p. 205. 



Similar in form and appearance to the preceding. Rostrum similar. 

 Head densely and coarsely punctured. Thorax obovate ; convex pilose as 

 in myrmex, sides arcuate, base strongly narrowed, surface coarsely, deeply 

 and densely punctured on the disc, more sparsely at the sides. Scutellum 

 ciiiereo-pubescent. Elytra oblong-ovate, strongly convex, striate, striae 

 moderately coarsely and sub-serrately punctured, intervals slightly convex, 

 with a single row of fine punctures each bearing an erect hair, either 

 cinereous or black. Body beneath black, shining, sparsely punctured 

 and with a cinereo-pubescent line at the sides. Legs sparsely punctured, 

 black, with erect hairs either cinereous or black. Femora with a minute, 

 acute tooth, tibhe as in myrmex. Length .16 inch ; 4 mm. 



I have seen but one specimen of this species, captured by Dr. John W. 

 Eckfeldt in Delaware County, Pennsylvania. By a casual examination 

 it might be confounded with myrmex, but the very densely punctured 

 thorax and small femoral tooth at once distinguish it. 



O. Chevrolatii Horn ; myrmecodes || Chev. Ann. Ent. Soc. Fr. 1832 

 p. 445. 



Black, shining. Rostrum smooth shining, above very slightly canali- 



