PTILODACTYLA. 629 



d' . Scutellum with, a shallow notch in front ; upper surface of the body more or 



less shining Species 27-29. 



e' '. Scutellum with a shallow notch in front, usually with a smooth, slightly 

 impressed, median line ; upper surface of the body opaque or dull, rugulose, 



thickly pubescent Species 30-32. 



f. Scutellum without trace of emargination in front, flat. 



e". Elytra punctate-striate Species 33. 



/". Elytra not or obsoletely striate Species 34, 35. 



. Tarsal claws with a rectangular or acute tooth in the female, the dilated 

 portion usually longer and always ending in a curved tooth in the male, this 

 tooth in some species (at least on the anterior tarsi) extending nearly as far 

 as the claw itself; body pubescent. 

 g' . Antennse with joint 3 not or a very little shorter than 4 *. 



g" . Prothorax transversely subquadrate, greatly explanate at the sides, wider 

 than the base of the elytra ; scutellum with a shallow notch in front : 



elytra confusedly punctured, the humeri raised and acute Species 36. 



h" . Prothorax much narrowed anteriorly, angularly dilated at the sides before 

 the base ; scutellum with a moderately deep notch in front ; elytra 



punctate-striate Species 37. 



%" . Prothorax much narrowed anteriorly, without angular dilatation at the sides. 

 h'". Scutellum with a deep notch in front, and broadly and deeply sulcate 



down the middle ; elytra obsoletely seriate-punctate Species 38. 



V". Scutellum with a deep notch in front and also narrowly sulcate down 

 the middle to near the apex ; elytra with the humeri subrectangular, 



the surface not or obsoletely striate • . . . Species 39. 



/". Scutellum with a deep or moderately deep notch in front ; elytra with 

 the humeri more or less rounded, the surface seriate-punctate or 

 punctate-striate f. 



h\ Elytra broadly caudate in the male Species 40. 



i 4 . Elytra not caudate in the male. 



c\ Prothorax with the basal margin more or less denticulate; 

 scutellum with a deep or moderately deep notch in front. 



a 6 . Antennse slender, with long rami in the male Species 41-50J. 



b 8 . Antennse stout, with shorter rami in the male : species small . Species 51. 

 d\ Prothorax with the basal margin smooth, or obsoletely denticulate 

 towards the sides only; scutellum with a shallow notch in front. 



c 6 . Antennae slender, with long rami in the male Species 52-55. 



d 6 . Antennse stout, with shorter rami in the male Species 56, 57. 



h'. Antennse with joint 3 considerably shorter than 4; prothorax subcorneal; 



scutellum with a shallow notch in front Species 58. 



. Tarsal claws longer, with a short angular tooth at the base ; scutellum with a 



deep notch in front ; body thickly pubescent. [ $ unknown.] Species 59. 



* Shorter in some males of P. forcipata. t Except in some specimens of P. mexicana, P. opima, &c. 



% P. angustata, Horn, from Florida, probably belongs to this section. 



