REHN AND HEBARD 45 



non-articulate styliform appendages; distal margin between these 

 appendages broadly and roundly emarginate or sinuato-truncate 

 or obtuse-angulate produced. Ovipositor from about one to one 

 and two-thirds times the length of the pronotal disk, deep, more or 

 less sharply bent upward at base, arcuate; apex more or less round- 

 ly acuminate; bent portion of dorsal margin and distal portion of 

 ventral margin finely serrate. Subgenital plate of female short or 

 elongate, triangular or lanceolate or scutiform, with immediate 

 apex rounded or angulato-emarginate ; a medio-longitudinal sulcus 

 present proximad. Limbs more or less elongate. Cephalic and 

 median femora carinate disto-dorsad for a short distance with 

 distal margin of same more or less produced; genicular lobes of 

 same produced, unispinose or bispinose. Cephalic tibiae with 

 proximal extremity much swollen, narrowing decidedly or appre- 

 ciably below tympanum which organ is open on both faces. 



Classification. — From a systematic standpoint the present genus 

 is divided into two natural groups, the first of these has the genic- 

 ular lobes of the cephalic and median femora produced in a single 

 dentiform process. All of the species having this character are 

 further separable by characters of the tegmina, which are obliquely 

 truncate at the apex, and of the male subgenital plate, which is 

 supplied with distinct articulate styles. The species belonging 

 to this first group are /. tolteca, intermedia, holivari and prasina. 

 Of these, the first three species are closeh^ related, while the lat- 

 ter species is a verj' aberrant and distinctive insect, distinguished 

 particularly by its size, coloration and great tegminal width. No 

 species belonging to this group is found as far north as the Rio 

 Grande. 



The second group of the genus has the genicular lobes of the 

 cephalic and median femora produced in a dentiform process, but 

 having in addition a small spine on the ventral margin of this proc- 

 ess. All of the species having this character are further separable 

 by characters of the tegmina, which are rounded at the apex, 

 and of the male subgenital plate, which is supplied with distinct 

 but non-articulate styliform appendages or knobs. The first two 

 species belonging to this group, /. phthisica and gracillima, are also 

 southern in distribution and are very different from any of the 

 others; they differ from the three normal species of the first group 

 in the group characters given above, and also in being more at- 



TRANS. AM. ENT. SOC, XL. 



