Scudder.] 284 [January 23, 



2. Moderately large species. Fastigium with parallel walls di- 

 rectly continuous with those of the frontal carina. Median carina 

 of pronotum more or less distinct on foremost division of anterior 

 lobe. Male with the apex of the last abdominal segment sharply 

 conical; anal cerci expanding apically to a broad plate. . . . 3. 



Small species. Tip of fastigium expanding laterally next the 

 upper ocelli. Median carina of pronotum very obscure or wanting 

 on the foremost division of the anterior lobe. Male with the apex 

 of last abdominal segment obscurely conical and docked; anal 

 cerci equal or apically forked 4. 



3. Antennas brightly colored; eyes not prominent; upper limit of 

 deflected lobes marked by a yellow stripe which extends on to the 

 head; median and anal fields of the tegmina, otherwise immaculate, 

 separated by a similar stripe; posterior lobe of pronotum nearly 

 smooth ; hind tibiae red. Male with the anal cerci expanded at 

 the base. Female with the upper valves of the ovipositor tapering, 

 finely pointed M. femoralus (Burin.) 



Antenna? dark colored ; eyes prominent ; no lateral stripe on the 

 pronotum or tegmina, the latter of which are spotted irregularly 

 with dusky blotches ; posterior lobe of pronotum rather coarsely 

 punctate ; hind tibiae particolored. Male with the basal half of anal 

 cerci equal. Female with the upper valves of the ovipositor searcely 

 tapering, bluntly pointed. . . . M. punctulatus (Uhl.) Scudd. 



4. Transverse sulci of anterior lobe of pronotum distinct; upper 

 half of divergent lobes but little darker than the lower half; teg- 

 mina as long as the abdomen. Male with the anal cerci forked at 

 the tip. Female stout M. collinus n. sp. 



Transverse sulci of anterior lobe of pronotum indistinct; upper 

 half of divergent lobes strikingly darker than the pale lower half; 

 tegmina much shorter than the abdomen. Male with the anal 

 cerci equal or nearly equal throughout, long, slender, and nearly 

 straight. Female rather slender M. rectus n. sp. 



5. Male with the marginal apophyses of the last dorsal segment 

 stout, parallel, reaching half way over the supra-anal plate ; anal 

 cerci tapering, pointed at tip, not more than half so broad on api- 

 cal as on basal half; apex of last abdominal segment entire. 

 Female with the median carina of the pronotum generally distinct 

 on the anterior lobe; prosternal spine nearly cylindrical, scarcely 

 tapering excepting at the extreme tip, which is generally bluntly 

 rounded M. femur-rubrum (De Geer) Stal. 



