218 PROCEEDINGS OF THE ACADEMY OF [April, 



Description of Type. — Size smaller than in M. attenuatus; form 

 slightly more attenuate, with pronotum less ample and head slightly 

 more prominent. Tegmina abbreviate, rotundate. 79 The important 

 genital characters, of which the form of the supra-anal plate (fig. 9) 

 and cercus (fig. 10) are the most decided, are given in the preceding 

 analysis, while the abdominal coloration, also given there, is dis- 

 tinctive in this sex. 



Allotype: 9 . Same data as the type. [Hebard Collection.] 



Description of Allotype. — The vertex is found to be less depressed 

 mesad and the facial costa still more weakly sulcate than in females 

 of M . decorus, while the dorsum of the pronotum narrows even less 

 than in that species and has, in consequence, the cephalic and caudal 

 width nearly subequal. 



The usual variation found in the two species, however, makes it 

 often impossible to separate females by the above characters, and we 

 are obliged to admit that we are unable to find definite differential 

 characters for females of the two species. 



Measurements (in millimeters). 



cT & 9 9 



type. Paratypes. Allotype. Paratypes. 



Length of body 16 15.8-16.8 24.7 21.2-25* 



Length of pronotum 3.8 3.7-4.1 4.9 4.9-5.3 



Length of tegmen 2.9 2.6-3.8 4.4 3.8-4.5 



Greatest width of same 2 1.8-2.4 2.8 2.6-3 



Length of caudal femur 9.9 9.3-10.1 13 12.4-13.1 



Greatest width of same 2.2 2.2- 2.4 2.8 2.7- 3 



The furcula of the present insect vary somewhat from the normal 

 regular and parallel form to one in which the sides are less regular 

 and the fingers divergent, the cerci also show some individual varia- 

 tion, two of the males have the ventral expansion of the tip of the 

 cercus decidedly produced and sharply acute-angulate. 



In coloration the series of specimens before us is quite uniform, 

 much resembling dark individuals of M. decorus, except that the post- 

 ocular fuscous stripe is abruptly terminated on the lateral lobes of 

 the pronotum at the principal sulcus and the males have the dark 

 markings on the sMes of the abdomen much more pronounced with 

 the dorsum of the same very dark. Half of the females have the 

 post-ocular fuscous stripe on the prozona interrupted by narrow 

 oblique pale fasciae as in M. australis. The dark males have a 



9 The tegmina show almost as much individual variation in this species as in 

 the others of this group. 



