THE CANADIAN ENTOMOLOGIST 185 



readily distinguishable by the elytral markings and the ferruginous anterior legs. 

 The ridges on the posterior legs vary much in size, in many specimens being 

 small and faintly indicated; some specimens show slight indications of rudi- 

 mentary additional ridges. " 



On account of the sexual difiference in the number of ridges, the writer 

 suggests that this species be placed in taxonomic sequence after Mordellistena 

 'morn at a. 



7. Mordellistena incommunis, sp. nov. 



Hmd tibia with three rather strongly marked oblique ridges; first joint 

 of hind tarsi with four, the second with three, small oblique ridges. 



Body linear, slightly cuneiform. Color black, showing in certain lights a 

 blueish-green iridescent lustre; head and prothorax rather sparsely covered 

 with yellowish-brown pubescence; antennae black; elytra with golden-yellow 

 pubescence along the suture, and on a rather broad vitta on each elytron, 

 extending from near the humeral angle to a little beyond the middle; under 

 surfaces black, with sparse yellowish-brown pubescence; legs black. Head a 

 little narrower than prothorax, finely punctured ; eyes small. Antennae filiform, 

 or slightly serrate; third joint one-fourth shorter and a little narrower than the 

 fourth, fifth to tenth joints nearly equal in length and width, each being very 

 little longer than the fourth; eleventh joint elongate ovate, one-fourth longer 

 than the tenth. Maxillary palpi scalene-triangular. Prothorax finely punctured, 

 as broad as long; widest one-fourth the distance from base to apex; slightly 

 rounded and converging toward apex; the base at middle (in front of scutellum), 

 truncate ; scutellum triangular ; elytra very little wider than the prothorax. 

 widest at middle, and slightly tapering toward apex ; moderately punctured. 

 Inner edge of femora and tibiae of anterior legs with long setae in the male, 

 finely pubescent in the female. Anal style long and very slender, with cinerous 

 pubescence at base. Length to end of the elytra, 3.5 to 4 mm., to end of the 

 anal style 4 to 5 mm. 



Four specimens examined : one from Riverside, near Chicago, Illinois, 

 collected on June 27 by Mr. C Sellinger; one from Sawyer Dunes, Berrien 

 County, MieJiigan, collected by Mr. T. H. Hubbell, and two from Aweme. 

 Manitoba, Canada, collected on- June 19 Mr. Norman Criddle. The male 

 holotype from Riverside, 111., is deposited in writer's collection ; the female 

 allotype from Sawyer Dunes, Berrien Co.. Mich., will be placed in the Museum 

 of Zoology, University of Michigan ; a paratype in Mr. Criddle's collection. 



This species somewhat resembles Mordellistena suttirclla Hel., but differs 

 in having the fourth to tenth antennal joints much shorter, and slightly serrate, 

 rather than elongate-parallel, and in coloration siiturella shows no trace of a 

 vitta on the disc of the elytra. It should be placed after Mordellistena aeqnalis, 

 M. conformis or M. pulchra, all of which have same number of ridges on 

 hind legs. __^ 



8. Mordellistena pulchra Liljeblad. 



Since the publication of the original description'^' of this species, the writer 

 has collected twenty-five additional specimens, including males, which have not 

 been described. 



5 Can. Ent. XLIX., 1917, p. 12. 



