io2 MEMOIRS ON THE COLEOPTERA 



drew attention to Mr. Schaeffer's error in uniting dimidiatus Mann., 

 with dispar Payk., the two species being abundantly distinct. The 

 two following species have not been described hitherto: 



Rhizophagus longiceps n. sp. Male elongate, parallel, evenly convex, 

 rather shining, though the entire upper surface is distincly micro-reticu- 

 late, evenly rufo-piceous in color, the legs bright rufous; head large, elon- 

 gate, evenly and moderately convex throughout and somewhat finely, 

 evenly and not closely punctate, fully as wide as the apex of the prothorax; 

 arcuate suture delimiting the small apical epistoma, distinct nearly to 

 the edges, the surface of the front behind it not at all impressed; eyes 

 rather small and not very convex, situated rather before the middle of the 

 length, the sides behind them evenly and feebly converging and evenly, 

 very feebly arcuate to the base; antennae smooth, the third joint distinctly 

 longer than the next two combined, the eleventh protruding well beyond 

 the tenth; prothorax fully a fifth longer than wide, the expanded apex 

 much wider than the base, the sides broadly but evidently sinuate, the 

 basal angles broadly rounded; punctures fine and sparse throughout, not 

 different toward the sides; scutellum transverse, semicircular; elytra barely 

 as wide as the thoracic apex and distinctly less than twice as long as the 

 prothorax, parallel, the sides straight, broadly rounding at apex; striae 

 moderate, feebly impressed, distinctly, rather closely and evenly punctate, 

 with a few punctures scattered over intervals 1-3 at base; pygidium fully 

 as long as wide, feebly convex, not very coarsely or deeply punctate, the 

 additional segment semicircular, shining and with smaller but deeper and 

 closer punctures; abdomen strongly and rather closely punctate, gradually 

 more finely and sparsely basally; outer anterior tibial angles everted and 

 acute, prolonged by a short spine, and there is another minute spine at 

 apical fifth; middle tibiae with about four small external spines in distal 

 half. Length (cf) 4.8 mm.; width 0.95 mm. Virginia (a single male, 

 probably taken by Mr. Richardson at Fredericksburg, but there is no 

 definite record). 



On comparing the type with a male of cylindricus Lee., from Ten- 

 nessee, it can be seen quite readily that, although rather closely 

 allied, the two are different specifically. In longiceps the head is 

 more elongate, being about as long as the prothorax, and not dis- 

 tinctly shorter than the latter and only just visibly elongate, as it is 

 in cylindricus, and, in the latter, the front just behind the small 

 epistoma is distinctly impressed, the sides behind the eyes more 

 arcuately swollen, the prothorax less elongate, with the converging 

 sides more nearly straight and the elytra more elongate, being twice 

 as long as the prothorax. 



Rhizophagus rectus n. sp. Male cylindric, evenly convex, rather 

 shining, pale and even rufo-testaceous in color throughout; micro- 

 reticulation subobsolescent anteriorly but distinct on the elytra; head 

 much smaller, not longer than wide and fully as wide as the prothorax, 



