GR YLLIDAE TRIGONIDIINAE 6 5 



TRIGONIDIINAE . 



Half the known genera of this subfamily occur with us, two of 

 which are shared with tropical America, while the third is 

 cosmopolitan. 



Genera of Trigonidiinae. 



a 1 . Last palpal joint infundibuliform, apically dilated; lower 

 margin of the facial scutellum transverse or arcuate ; basal joint 

 of antennae subdepressed, pretty large ; lateral lobes of pronotum 

 subquadrate, the lower margin subhorizontal, subexcised in the 

 middle. 



b l . Foramina of fore tibiae wanting or found on one side only. 



Anaxiphus Saussure. 



b 2 . Foramina of fore tibiae present on both sides. 



Cyrtoxiphus Brunner. 



a 2 . Last palpal joint dilate, foliaceous ; lower margin of the 

 facial scutellum angularly excised in the middle ; basal joint of 

 antennae narrow, minute ; lateral lobes of pronotum narrowed 

 anteriorly, the lower margin not excised. Phylloscirtus Gu6rin. 



These genera are represented by only one or two species each, 

 and these are almost entirely confined to the Southern States, and 

 to the region east of the Rocky Mountains. 



ENEOPTEKINAE. 



Only four of the twenty-nine known genera of this group occur 

 in the United States, and all are shared with tropical America. 



Genera of Eneopterinae. 



a 1 . Tegmina of male provided with a stridulatory tympanum. 

 b 1 . At least three or four oblique veins traverse the median 

 area of the tympanum of the male tegmina, reaching to its pos- 

 terior portion. .... Paroecanthus Saussure. 

 b 2 . No more than two oblique veins traverse the median area 

 of the tympanum of the male tegmina, and are found in the 

 proximal portion only. 



