12 rrvOCEEDIlsrGS of the national museum vol.72 



The general practice, which seems ahnost a necessary one in ento- 

 mological taxonomy, is to recognize only those genera that are based 

 on identifiable species. Use of the generic term Canofus is an 

 eclecticism possibly justified by the certainty that it does apply to 

 the insects under consideration, even if the genotype, because a 

 nymph, is with present knowledge, unidentifiable. If the holotype 

 continues to exist until identification of nymphs becomes possible, 

 then and not till then will the genus have a definite genotype. If in 

 the end the holotype proves unidentifiable, there should be used for 

 the genus the name Canopus, or a synonj'-m, dating from the earliest 

 publication in which a positively identifiable species is included. 

 C'ursula Walker also was founded on immature specimens. Chlo^eiio- 

 coris was based on an adult of a species described by Fabricius in 

 the genus Tetyra. 



Besides the characters mentioned in the key to subfamilies the 

 following are common to all of the species of Cam.o'pv)^^ seen by the 

 writers: Outline, as seen from above, obovate, slightly narrower 

 posteriorly than anteriorly; dorsal outline, as seen from side, almost 

 evenly curved; part of head in front of eyes as long as, or longer 

 than, an eye, vertex with more or less impressed lines defining the 

 tylus, and oblique impressions each side, but scarcely punctate ; head 

 and pronotum with slightly reflexed margins; corium carinate cos- 

 tally, showing one definite longitudinal vein, with a definite longi- 

 tudinal series of punctures exterior, and scattered punctures interior, 

 to it ; pronotum with a median longitudinal impressed line anteriorly, 

 and a more or less defined transverse impression, in or along which 

 are fewer or more numerous punctures, and at each end of which is 

 a smaller or larger group of punctures; scutellum with a row of 

 punctures or traces thereof along basal margin, with a distinct lunate, 

 impressed and punctate line, marking off an area near the base which 

 is polished discally, but contains some punctures laterally, surface of 

 scutellum behind this line more or less punctate. Color black, and 

 in most species, perhaps in all, there are individuals with aeneous or 

 purplish reflections. 



KEY TO THE SPECIES 



1. Metapleiiral ostiole with a! broad lip; the opaque ostiolar field but little 

 extended upon mesopleurum, attenuate laterally, ending upon suture 

 between meta- and meso-pleura, and not extending to lateral margin; 

 head smoother on the average than in the contrasted group; apical seg- 

 ment of antenna not pale at base ; subcostal series of punctures on corium 



not in a depression, the area bearing them almost flat 2 



Metapleural ostiole with a narrow lip ; the opaque ostiolar field occupying 

 nearly half of mesopleurum and extending to lateral margin where it 

 has the form of a narrow strip entirely across end of mesopleurum; 

 oblique impressed lines on head more evident on the average than in the 



