276 PROCEEDINGS OF THE NATIONAL MUSEUM vouioe 



femora rather thick, yellowish adorned with a wide broAvn ring towards 

 the middle and another one quite near the apex; tibiae with three 

 brown rings; tibial spines brown; external apical spurs yellow, internal 

 spurs brown; metatarsi long, yellow with brown top, 2d joint brown. 



Elytra extending almost to the apex of abdomen, testaceous with 

 brown extremity; dorsal field presenting six quite straight, parallel 

 projecting veins; transverse veinlets very few; lateral field with four 

 regularly distant veins. No wings. 



Length of body 5 mm.; posterior femur 4.6 mm.; elytra 2.7 mm. 



Remarks: This is the first species of the genus Rhicnogryllus found 

 in America. 



Family Eneopteridae 



Key to the American genera 



1. Apical spurs of the posterior tibiae long, the median longer than the other 



two either side {Eneopterinae group) 2 



Externoapical spurs of the posterior tibiae very short, almost equal in length; 

 internal spurs very different in length, the superior the longest {Podoscir- 

 iinae group) ^ 



2. Posterior metatarsus long 3 



Posterior metatarsus short ^ 



3. Posterior femora very long; elytra extending beyond the apex of abdomen. 



Eneoptera Burmeister 

 Posterior femora rather short; elytra extending only to the apex of abdomen. 



Ponca Hebard 



4. Frontal rostrum three times as wide as the first antennal joint; elytra of male 



a little shorter than abdomen, with a perfect mirror . Ligypterus Saussure 



Frontal rostrum scarcely v/ider than the first antennal joint; male elytra 



without mirror Eneopteroides, new genus 



5. Posterior tibiae armed with strong spines but without denticles at base or 



before the spines Stenogryllus Saussure 



Posterior tibiae armed with spines and denticles 6 



6. Posterior tibiae armed with two or three spines towards the apex. 



Chremon Rehn 



Posterior tibiae armed with five or six spines occupying more than the distal 



half -7 



7. Body strongly elongate; posterior metatarsus long with two rows of denticles 



(anterior tibiae nonperf orated ; elytra of male small, without tympana). 



Cylindrogryllus Saussure 



General shape variable but not so elongate; posterior metatarsus rather 



short S 



8. Elytra of the male provided with a mirror 9 



Elytral venation similar in both sexes 18 



9. Head globular; vertex short, without rostrum, transversely carinate (anterior 



tibiae perforated either side) Phyllogryllus Saussure 



Head with a prominent rostrum between the antennae 10 



10. Head vertical; mouth directed downwards 11 



Head horizontal; mouth directed forwards (anterior tibiae perforated on 



the external face) Ectotrypas Saussure 



