76 GEO. H. HORN, M. D. 



G. sexvittata Lee, Proc. Acad. 1865, p. 215. — Oblong oval, rather depressed 

 as compared with americana, dull yellow or pale brown, opaque; thorax with 

 three distinct spots, each elytron with three slender piceous vittse. Autenuge 

 entirely black. Head densely punctured, a vague median depression with a 

 piceous line. Thorax twice as wide as long, distinctly narrower in front, sides 

 arcuate, hind angles distinct, disc densely punctured and opaque, a vague de- 

 pression each side a median piceous line and a spot each side; scutellum black ; 

 elytra slightly broader behind, liumeri distinct, but obtuse; lateral margin not 

 oxplanate, apices obtuse, sutural angles slightly retracted, disc rather densely 

 punctured aud opaque, on each side three entire piceous vittse. Body beneath 

 similar iu color to the upper surface, the hind margins of the ventral segments 

 darker. Legs concolorous, tibise on the outer side, tarsi and a median femoral 

 spot piceous. Length .20 — .24 inch. : 5 — 6 mm. 



The sexual characters are as in americana. Dr. LeConte mentions 

 a transverse clepi'ession on each side of the last ventral segment, but 

 this is more or less evident in all the species. In the ample number 

 of specimens examined no notable variation has been observed. 



This species could only be mistaken for a variety of americana, 

 and on the other hand some of the varieties of the latter might be 

 mistaken for this, but the two may be separated by the much coarser 

 and less close punctures of americana, which also has erect pubes- 

 cence, while in sexvittata the pubescence is always recumbent and 

 always present. Fi'om integra, which resembles the present in mark- 

 ings and somewhat in sculpture, sexvittata may be known by the 

 separated middle coxse. 



Occurs from Pennsylvania to Loui-siana. 



G. cavicollis Lee, Proc. Acad. 1865, p. 216. — Oval, nrrrower in front, sub- 

 depressed ; color dull red, slightly shining, very sparsely finely pubescent. An- 

 tennte entirely black. Head red, coarsely punctured, without median depression, 

 frontal tubercles smooth. Thorax nearly twice as wide as long, narrower in 

 front, sides arcuate, or obtusely subaugulate, hind angles distinct, base on each 

 side obliquely sinuate, disc feebly convex, a broad depression each side and 

 another along the middle, surface coarsely punctured, more densely in the de- 

 pressions; scutellum red ; elytra broader behind the middle, sides arcuate, mar- 

 gin explanate, humeri distinct, but rounded; sutural angle well mai'ked, but 

 obtuse; disc with coarse and deep punctures not crowded, less deep near the 

 apex, interspaces smooth, shining. Body beneath red, the metasternum often 

 piceous, sparsely finely punctate and finely pubescent. Legs variable in color 

 entirely red to almost entirely piceous. Length .18 — .22 inch. ; 4.5—5.5 mm. 



Male. — Claws finely bifid at apex. Last ventral segment broadly emarginate 

 at apex, with a deep triangular depression limited by a sharply elevated line. 



Female. — Claws more deeply bifid, the parts more divergent. Last ventral 

 segment with a ve:-y slight emargination, in front of which is a slight fovea. 



The middle coxse are absolutely contiguous, the mesosternum is 

 not prolonged between them, except as to the color of the legs no 

 variation has been observed in this species. 



