AKTERICAN COLEOPTERA. 47 



var, discoidea | Lee. — Occiput and disc of thorax black. Legs entirely 

 fuscous. 



var. . — Head entirely black. Thorax rufous. Legs rufous, tibiae and 



tarsi fuscous. 



The first var. occurs from the Middle States to Texas, the second 

 in Florida, the thiid Texas. 



The last variety approaches the next species but the elytra are merely 

 truncate, the epipleura^ black and the abdomen entirely rufous. 



O. texana n. sp. — Form slender, yellowish testaceous. Head, antennae 

 and elytra black, sparsely cinereo-pubescent. Thorax with two callosities 

 and an ante-scutellar black spot. Elytra truncate and subbispinose at tip. 

 Epipleurae pale at base. Legs yellow, tips of tib'se and tarsi fuscous. Abdomen 

 yellow, last segment, sometimes the sides of the second and third fuscous. 

 Length .54 inch; 13.5 mm. 



This species resembles some of the varieties of the preceding, and 

 even himacuhta but in the latter case the body beneath and legs are 

 entirely black. 



Occurs in Texas. 



O. tripiinctata Swed. — Elytra flavo-testaceous with a sutural and lateral 

 fuscous stripe. Thorax with two callosities. Legs always pale. The body 

 beneath may be entirely fuscous or pale yellowish with merely a lateral 

 metasternal space and spots on the sides of the second and third ventral 

 fuscous. 



var. myops Hald. — Body beneath pale, fuscous spots on the sides of meta- 

 sternum and second and third ventral segments. Head yellow. Elytra pale 

 yellowish with a lateral stripe fuscous. Thorax with two discal spots only. 



var. mandarina Fab. — Abdomen variable, sometimes entirely fuscous, elytra 

 with sutural and lateral stripe fuscous. Antennae usually annulated. Thorax 

 with ante-scutellar spot, 



var. . — As in the preceding, head fuscous, antennae not annulated. 



Occurs from the northeastern States to Colorado and Georgia. 



O. gracilis Fab. — Pale yellowish testaceous. Antennae fuscous. Thorax 



densely punctured, without callosities. Elytra with lateral stripe fuscous. Legs 

 pale, tips of tibiae and tarsi darker. • 



Occurs in Georgia. 



O. ruficollis Fab. — Pale rufous. Antennas and elytra nearly black, the 



latter cinereo-pubescent, epipleurae pale at base. Thorax without callosities. 

 Tibiae and tarsi fuscous. 



I have seen but one instance of variation. This has a very indis- 

 tinct pale vitta extending from base to tip of elytra, at middle. 



Occurs from Connecticut to Georgia. 



It must not be supposed that every specimen is amenable to 

 classification by the foregoing table and remarks. The species are 



