REHN AND HEBARD 19 



are more related to Orchelimum than to Conocephalus occupj'ing 

 a more or less intermediate position, yet in themselves clearly- 

 cut divisions of equal rank to certain other aggregations of the 

 subfamily Conocephalinae. We have been forced to realize that 

 we have more groups in the Orchelimum-Conocephalus complex 

 than have previously been recognized bj^ name and the only 

 solution appears to be to designate those divisions which are 

 found to be distinguished by characters of comparative impor- 

 tance, and assemble them as subgenera under the two generic 

 names Orchelimum and Conocephalus according to the extent of 

 agreement or degree of development of certain features. 



Subgenera and Specific Groups. — The three subgenera of Orche- 

 limum which we here recognize can be distinguished as follows : 



Stridulating field of male tegmina relatively large and broad, 

 as large in area as dorsum of pronotum, speculum not elongate. 

 Humeral sinus of lateral lobes of pronotum more or less distinctly 

 indicated, rarely {gladiator) obsolete. Genicular lobes of caudal 

 femora bispinose. Ovipositor with ventral margin regularly 

 arcuate (except in militare). Orchelimum s. s. 



(Type — 0. cuticulare SeryiWe = glaherrimum Burmeister.) 



Stridulating field of male tegmina relatively large, about as 

 large in area as dorsum of pronotum, speculum decidedly elon- 

 gate, narrow. Humeral sinus of lateral lobes of pronotum well 

 indicated, arcuato-emarginate. Genicular lobes of caudal femora 

 bispinose. Ovipositor with ventral margin gently arcuate or 



straight proximad, arcuate distad. o^ ? j o u 



^ ^ ' Stenorhoptrum ^ new subgenus 



(Type— 0. volantum McNeill.) 

 Stridulating field of male tegmina relatively small, not as large 

 in area as dorsum of pronotum, speculum of normal shape but 

 small (except in superhum) and Conocephalus-Y\^& in form. Hu- 

 meral sinus of lateral lobes not at all or but weakly indicated. 

 Genicular lobes of caudal femora unispinose. Ovipositor ? (fe- 

 male unknown) ir . 7 j m i 



Metarhoptrum 1° new subgenus 



(Type — Xiphidium unispina Saussurc and Pictet.) 



' Srews narrow, poirrpov tambourine. 



^^ Ultra between, poirrpov tambourine. In allusion to the intorniodiate char- 

 acter of the male speculum. 



TRANS. AM. ENT. SOC, XLI. 



