PROC. ENT. SOC. WASH., VOL. 20, NO. 4, APR., I'.Hi 75 



Preliminary tables of our American species according*to the new 

 arrangement are herewith presented, arranging Magdalinus and 

 Magdalis separately, and for the present leaving alone the ques- 

 tion as to whether they are groups or subgenera. 



Table of the North American Species of the group Magdalinus Schbnherr. 



(After Fall.) 



1. a. Antennae inserted approximately at basal two-fifths of the beak 



in the male, and at basal one-third in the female (group 

 lecontei} ...................................................... 2 



b. Antennae inserted at or slightly behind the middle in male, a 



little more posterior in female, usually at or near the basal 

 two-fifths (group gentilis) ...................................... 6 



c. Antennae inserted distinctly beyond the middle in male, and 



at about the middle in female (group alutacea) ............... 9 



2. Size 3.5-7 mm.; color typically rather brilliant blue or green, 



lecontei Horn 3 

 Size smaller, 3 mm.; black throughout or with the elytra faintly 



bluish ........................................................ 4 



3. Varieties of lecontei Horn. 



a. Color brilliant blue or blue green ................. lecontei Horn 



b. Prothorax dark purplish-blue, elytra violaceus, varying to 



entirely brilliant green ............................ superba Fall 



c. Entirely black ..................................... tenebrosa Fall 



d. Black, elytra dark blue or bluish black .......... tinctipennis Fall 



4. Prothorax strongly convex, beak longer and more arcuate, elytra 



faintly bluish, moderately shining; intervals narrow, convex, 



convexicollis Fall 



Prothorax normally convex, beak less strongly arcuate, color 

 black, luster dull, elytral intervals flatter and more rugose, 



austera Fall 5 



5. Varieties of austera Fall. 



Prothoracic punctures not confluent, color dull black, elytra with 

 faintest suspicion of blue ........................... austera Fall 



Prothoracic punctures more or less longitudinally confluent, elytra 

 with dark blue or greenish luster ................. substriga Fall 



6. Femoral tooth obtuse, rudimentary, antennae of male inverted 



very slightly behind the middle of the beak, second funicular 

 joint much less than twice as long as wide ............. vitiosa Fall 



Femoral tooth acute, well developed ............................... 7 



7. Elytral striae lightly or scarcely impressed, the intervals nearly 



flat .............................................................. 8 



Elytral striae rather strongly impressed, the intervals distinctly 

 convex. . . .xtriufn. Fall 



