12 E. T. CRESSON. 



r 



51. Abdomen with a spot of silvery pubescence on disk of first segment and also 



on apical middle of second ; apex of abdomen with pale glittering 



pubescence : head golden pubescent 58. beliivosM Cress. 



Abdomen with apical margin of first segment, and all the segments beyond 

 the second, silvery, with a central black stripe, continuous with that 

 on second segment; head silvery pubescent with a reddish-brown spot 

 on vertex 59. bellifera Cress. 



52. Apex of abdomen with a median silvery pubescent spot on segments 2-5; the 



two spots on second segment more or less oblique, yellow. (See jJ 59). 



60. iHfevittata Cress. 



Apex of abdomen with a median silvery spot on segments 4-5 only ; the two 



spots on second segment transversely quadrate, not oblique, generally 



blood-red. (See ^ 58) 61. deinissa Cress. 



53. Thorax laterally, at base of mesothorax, with a large, stout obtuse tooth, be- 



tween vv'hich and the prominent tuberculiforn) metathoracic spiracles 



is a deep notch ... -54. 



Thorax not toothed laterally 56. 



54. The spots on second abdominal segment large, rounded or quadrate 55. 



The spots on second segment narrow, linear, those at base longitudinal, those 



near apex transverse and only slightly separated medially; thorax 

 with two slender silvery pubescent stripes not reaching prothorax. 



77. solemn is Cress. 



55. Entirely black, except the four dull red shining spots on second abdominal 



segment and a slender silvery pubescent stripe on segments 4-5. 



62. atripes Smith. 



Head and anterior half of thorax black, the posterior half golden pubescent, 



except a black stripe on middle of metathorax ; the four spots on 



second segment large, irregular in shape, orange-yellow, the basal 



spots sn)aller and quadrate 63. 4-UOt'ata Klug. 



56. Thorax black, posterior margin of mesothorax, and metathorax except a 



median black stripe, golden pubescent, as well as spot on apical sides 

 of segments 2 and 3, and all of segments 4 and 5 ; the spots on second 

 segment orange red, the subapical ones very large, irregular, those at 

 base much smaller; head entirely black 64. iueriiiis Klug. 



Thorax with an entire central stripe of pale ochraceous pubescence; second 

 segment above with two large, rounded, deeply punctured, shining, 

 blood-red spots, and two oblique smaller spots of same color at base 

 nearly confluent with the larger ones; segments 4 and 5 with a 

 square discal spot of pale ochraceous pubescence. 



65. (Iorf«uvittata Cress. 



Thorax with two silvery or golden stripes, generally confined to metathorax 

 and base of mesothorax ; apex of abdomen with a central silvery 

 stripe, occasionally abbreviated to one or two spots 57. 



57. Head clothed with silvery or griseous pubescence; thoracic vittse broad and 



entire 58. 



Head above with a median spot of golden or silvery pubescence 60. 



Head above with a transverse or subarcuate baud of silvery pubescence. .62. 



Head above with two silvery or golden pubescent suborbital stripes 65. 



Head above entirely black 66. 



