Dec, I9I3-] Schaeffer: Notes on Rhizophagus. 309 



NOTES ON SOME NORTH AMERICAN SPECIES OF 

 RHIZOPHAGUS (COL. NITID.). 



By Charles Schaeffer, 



Brooklyn, N. Y. 



Going over a few of our North American species of Rhizophagus 

 at the request of Mr. A. Mecignon of Orleans, France, the following, 

 mostly synonymical, notes were made. 



Two new North American species are described by Mecignon which 

 are unknown to me and the characters used in the new table given 

 below are taken from the descriptions, those for R. procerus were 

 kindly supplied by Colonel Casey. 



Table of the North American Species of Rhizophagus. 



1. Middle tibiae at sides with three long spines at about apical half 2. 



Middle tibiae without or with very small spines 3. 



2. Front tibiae with a rather long, acute spine above the apical tooth. 



sayi n. n. 

 Front tibiae without acute, long spine above the apical tooth. c^'/iHiiricM.y Lee. 



3. Third joint of antennje as long as the following three combined. 



parallelocollis Gyll. 

 Third joint of antennae shorter than the following three combined 4. 



4. Second elytral interval dilated and punctate at base grouvellei Mec. 



Second elytral interval not dilated nor punctate at basei 5. 



1 A few punctures are seen occasionally in some species but the interval is 

 not dilated near base. 



5. Antennae apparently ten-pointed, the eleventh hidden in the tenth, the 



tenth truncate or subtruncate at apex ; color brown, punctuation on 



thorax and elytra coarse fenyesi Mec, brunneus Horn. 



Antennae distinctly eleven-jointed 6. 



6. Prothorax elongate, as long or longer than wide 7. 



Prothorax short, wider than long 9. 



7. Elytral intervals convex, striae deeply impressed ; prothorax exactly quad- 



rate procerus Casey. 



Elytral intervals flat 8. 



8. Abdomen and upper surface alutaceous, elytral striae more or less distinctly 



impressed ; color generally piceous or brown scalp turatus Mann. 



Abdomen and upper surface shining, elytral striae not impressed, except the 

 sutural or first and sometimes the second stria more or less distinctly; 

 color piceous, elytra with narrow basal space and generally the apex 

 reddish dispar Gyll. 



