42 



Ajial cerci of male of excessive moderately large but not excessive. 



lengtli, very conspicuous, more than seldom one-fifth the length of the hind 



one third the length of the hind tibia;, tibia;. 



Ser/meiit jjrecediny supra-anal plate furnished with more or less conspic- 



of'male entire, without marginal apo- uous, paired, marginal apophyses, aris- 



physes. ing from the middle of the hinder 



edge, generally taking the form of 

 pointed, more or less depressed, diver- 

 gent lobes, lying in the lateral sulci of 

 the supra-anal plate. 



It lias been generally supposed that we had only two species of 

 Melanoplus in New England, the common species mentioned by Dr. 

 Harris in his Report on Injurious Insects, under the names Acridium 

 Jlavoviitatum and A. femur-ruhrwn. Mr. Uhler indeed had given a 

 MS. name to a single specimen of a distinct species from Maine, and 

 I had described the same in 1862 under his name Caloptenus 

 punctulalus ; but as no other specimens were discovered, doubt was 

 thrown upon its proper habitat; others, however, have now been 

 found, and the species appears to be peculiar to the Northern States. 

 More recently, Mr. Riley has described a fourth species (which has 

 been separated from M.femur-rubrum in my cabinet for ten years) 

 under the name of Cal. allaiil'iA-^ and in the present paper two addi- 

 tional species are made known which will be more fully described 

 in a memoir now in preparation. 



These six species may be separated by the following table. 

 1. Tegmina scarcely exceeding, often much shorter than, the abdo- 

 men. Male with the median marginal apophyses of the last dor- 

 sal segment no longer than the segment itself. Female with the 

 basal tooth of the lower valves of the ovipositor small, obscure 

 blunt, much broader than long. Two callosities on the under 



surface of the first hind tarsal joint 2. 



Tegmina much exceeding the abdomen. Male with the median 

 marginal apophyses of the last dorsal segment more than twice 

 as long as the segment itself, extending conspicuously along the 

 lateral sulci of the basal half of the supra-anal plate. Female 

 with the basal tooth of the lower valves of the ovipositor promi- 

 nent, sharp, nearly or quite as long as broad. Three callosities on 

 the under surface of the first hind tarsal joint 5. 



iThis was first called atlanls by Riley; but in his later writings he has used the 

 corrected form, atlantls. 



