218 WILLIAM J. FOX. 



Basal excavated portion of middle segment not inclndint; half of the en- 

 closed area and forms little more than a deep, foveolated furrow; tarsi 



not at alt yellow siiIoiiK. 



69. — Seutellum immaculate 70. 



Scutellum maculated with yellow; episternal furrow of mesopleurfe sinuous 



(clypeus spotted with yellow) maciiliclypeus. 



70. — Episternal furrow of mesopleune forming an obtuse angle at about the mid- 

 dle; two convexities of the enclosure of middle segment smooth, glab- 

 rous |»ro|»iiiquii!i«. 



Episternal furrow of the mesopleurae not angular, almost straight, or slightly 

 curved ; the two convexities of the enclosed area of middle segment with 



microscopic striations, opaque Iliiilillliis. 



71. — Pronotum not ridged or margined, rounded at the sides 72. 



Pronotum strongly ridged, dentate laterally; head quadrate, nearly as long 



as broad ; tibise and tarsi yellowish ; otherwise black iiisoleiis. 



72. — Thorax not maculated with yellow 73. 



Pronotum and scutellum yellow ; apical margins of abdominal segments 



broadly testaceous iiiipret^sirroiis. 



73. — Enclosure of middle segment very strongly raai'ked, the imjiressed lines 



forming it more or less foveolate 74. 



Enclosure of middle segment not strongly marked, rather indistinct, the 



lines forming it not foveolate 76. 



74. — Posterior face of middle segment transversely rugose, lines forming the en- 

 closure very broad and deep, strongly foveolate 75. 



Posterior face of middle segment rugose on apical portion only; lines form- 

 ing the enclosure neither broad nor dei^x), not strongly foveolate (legs and 



antennse entirely bhwjk) ater. 



75. — Base of hind tibise yellowish ; enclosure of middle segment bounded out- 

 wardly by a narrow, smooth strip, which is broadest basally-oiiicti pes. 

 Hind tibite entirely black ; enclosure of middle segment bounded outwardly 



by a broad, smooth strip, which is broadest apically iligror. 



76. — Pronotum with a small, blunt prominence laterally; head with distinct 

 punctures, those of the front particularly so; medial channel of posterior 

 face of middle segment elongate fusiform ; all the tarsi brownish. 



iii^ricoruis. 

 Pronotum without a prominence of any sort laterally; head indistinctly 

 punctui'ed, the front likewise; medial channel of posterior face of mid- 

 dle segment broad above, iwinted apically ; fore and medial tarsi yellow- 

 ish testaceous Harriiigtoiiii. 



77. — Epimerum mesopleuralis distinctly ridged anteriorly 78. 



Epimerum mesopleuralis not at all ridged anteriorly 79. 



78. — Petiole of abdomen nearly as long as the two following segments united, 

 narrow, but little nodose at apex ; head longer than broad and with the 

 thorax coarsely punctured ; greater part of abdomen red. 



abdoininalJN. 

 Petiole of abdomen but little longer than the second segment, stout, dis- 

 tinctly nodose at apex ; head transverse, broader than long and with the 



thorax finely punctured ; abdomen entirely black «lecorns. 



79. — Petiole of abdomen longer than the following segment, slender; coxaj yel- 

 low ; anterior margin of clypeus angularly produced 80. 



