THE CANADIAN ENTOMOLOGIST. Ill 



The accumulation of more material in our collections will probably 

 still reduce the above number of species ; and I venture to express my 

 belief that bockia?ia may prove to be conspecific with hele?iœ, brevicornis 

 and iîicrassata with harfordi, and uteana with hele?iœ. This reduced 

 number of forms can be tabulated roughly as follows : 



I. — Eastern Forms: 



1. Abdomen strongly dilated in the middle floridana Csy 



Abdomen at most only moderately dilated in the middle 2 



2. Prothorax broadly excavated in the male baltifera Lee 



Prothorax not excavated in the male 3 



3. Colour bluish-black atrohicens Csy 



Colour black 4 



4. Prothorax bifoveolate at base bockiaiia Csy 



Prothorax not bifoveolate nigrella Lee 



II. — Western Forms: 



1. Middle acetabula open behind laticollis Csy 



Middle acetabula entirely closed 2 



2. Prothorax broadly, entirely concave in the male experta Csy 



Prothorax never broadly and entirely concave in the male 3 



3. Prothorax not bifoveolate in the basal impression harfordi Csy 



Prothorax bifoveolate in the basal impression 4, 



4. More or less shining helenœ Csy, 



Rather opaque crebrepunctata Csy, 



The described Central and South American forms are : 



1. dissimilis Shp., Biol. Centr. Amer. Col., I, 2, 1883, 173 (Homalota). 



2. nigricans Shp., ibid., 227. 



3. fragilis Shp., ibid., 227. 



4. mexica?ia Shp., ibid., 228. 



5. boliviana Brnhr., Bull. Soc. Ent. Ital., LX, 1908, 247. 



1. G. dissimilis Shp. is tentatively placed here in the genus Gnypeta ; 

 it is described from a single specimen. 



2. nigricatis Shp. — In our fauna bockiana Csy. seems to be the near- 

 est relative of this form. 



3. fragilis Shp. — A good species, having no relatives in the nearctic 

 fauna ; recognizable by the pale eleventh antennal joint and the impunc- 

 tate basal impressions of the first tergites. 



