272 Annals Efitonwlogical Society of America [Vol. XI, 



resemble those of var. conspersiis but the membrane is infuscate 

 and unspotted. The venter is dull bronzy black and the margins, 

 to beyond the spiracles, rufescent, sometimes also with rufous 

 spots on the disc; lateral rufescent band is sometimes broken 

 into segmental maculae. 



Described froni Huachuca Mountains, Arizona. A pair of 

 topotypes was kindly loaned the author by Mr. Barber. 



1."). Alydus scutellatus Van Duzee. 

 Alydus scutellatus Van Duzec (1903) 108', (1917)'^; Cockerel] (1910)^ Barber (1911). 



Description. — Color variegated brown and black. Head above black 

 with mesal and lateral rufous or flavous lines and about four spots of 

 the same color, two behind the ocelli and two between antennse. 

 Antennae as in eurinus, fourth segment shorter than second and third 

 together. Pronotum with anterior margin dull black and mediodorsal 

 line depressed; posterior two-thirds, and corium, fulvotis brown, spotted 

 with black. Membrane varying from pale between veins to fuscous 

 throughout, venation varied, but always irregular and reticulated. 

 Venter of head and thorax black, that of abdomen black with flavescent 

 or fuscous markings \-arying from a small area on the fifth ventral to 

 the entire abdomen. Feinora fuscous to piccous, posterior with a 

 broad subapical pale annuhis. 



Male with claspers (Fig. (5) more elongate than in other' species, 

 amied inside near apex with an expanded triangular tooth, and curved 

 sharply ccphalo-latcrad at tip. Female unknown. 



Described from New Mexico^ and reported since from 

 Colorado^"'', Montana -~°, and British Columbia-. A specimen is 

 also in the Milwaukee Museum labeled ''Rauterberg col., 

 Dubuque, Iowa.'' It is possible that this is a boreal and alpine 

 form which will be found along the upper Mississippi. In the 

 Rocky Mountains it has been collected from 8000 feet up to the 

 timber line. 



The species is well marked and comparatively constant. 

 The peculiar genitalia, annulate femora, and black scutelhmi 

 cause it to be unmistakable. Cockerell's material differed from 

 the type in the pale but spotted venter and comparatively pale 

 membrane. 



1(). Alydus pilosulus Herrich-Schaeffer. 



Alvdus pilosulus H.-Sch. (1848) 101; Uhler (1876) 294', (1878b) 384^; Alontandon 

 (1893)50^ Montgomcrv (1902)^; Bueno (1905)^ (1908b)e, (1910b)'. (1913a)«; 

 Hine (1907?)»; Tucker (1907a)io, (1907b)"; Bueno and Brimlev (1907)'-; Van 

 Duzee (1909)'^ (1914)'S (1917)'^; Smith (1910)"''; Bueno and Englehardt 

 (1910)''; Barber (1911)'^ (1914)'='; Parshley (1914)--^". 



Alydus eurinus vStal (1870) 213, nee Say. 



[Alydus vittiuosiis Harris, (Cata. Ins. Mass. 1833) according to Uhler (1878) 384]. 



