NO. 2130. NORTH AMERICA RHAPHIDOPHORINAE—CAVDELL. 687 



A large black male specimen in the Scudder collection has the pro- 

 notum 9 mm. long and the posterior femora 23 mm. Black and brown 

 ones almost as large are in the collection of the United States National 

 Museum, while other apparently fully grown males are much smaller. 

 The posterior femora vary considerably in comparative length, 

 ranging from two and one-haK to tliree times the length of the pro- 

 notum, but this variation is correlated with neither habitat nor 

 color. The insects vary in color from the uniform black, through 

 various shades of dark brown to a nearly uniform yellowish brown. 

 There seems to be a complete gradation in this variation of both size 

 and color. The extremes occupy common ground and are evidently 

 of no racial distinctness, though certain forms may be designated as 

 color varieties. The color varieties thus recognizable may be sepa- 

 rated by the followmg key: 



KEY TO THE COLOR VARIETIES OF UDEOPSYLLA ROBUSTA. 



1. General color black, top of thorax and legs sometimes lighter nigra Scudder. 



General color ranging from dark brown to medium or light reddish or yellowish 



o 



brown ■ • 



2. General color ranging from dark brown to medium reddish brown, sometimes 



noticeably marked with blackish robusta Haldeman. 



General color an almost uniform light yellomsh brown devius Scudder. 



UDEOPSYLLA ROBUSTA Haldeman. 



Udeopsylla robusta Haldeman, Proc. Amer. Assn. Adv. Sci., vol. 2, 1850, p. 346. 

 Marsa arcuata Walker, Cat. Derm. Salt. Brit. Mus., vol. 2, 1869, p. 254. 

 Udeopsylla compacta Bruner, Can. Ent., vol. 23, 1891, p. 38. 

 CeuthophUus polilus Scudder, Proc. Davenp. Acad. Sci., vol. 9, 1902, p. 56. 



This, the most common form, and the typical variety, occurs in 

 various shades of brown and reddish brown connecting the black 

 nigra with the yellowish-brown devius. In the synonymy under this 

 form is to be placed the CeutJiopUlus politus of Scudder,^ the type 

 of which has been studied and found structurally the same as robusta 

 and agreeing in color. Scudder states that the anterior femora of 

 'politus are unarmed beneath on the inner margin, but it really has a 

 distinct preapical spine. 



UdeopstjUa compacta Bruner is correctly hsted in the synonymy 

 under robusta. 



As stated under the discussion of the genus, the type of Marsa 

 arcuata Walker was examined and found to be a Udeopsylla referable 

 to the synonymy under the present variety. The unique male type 

 measures as follows: Pronotum, 7 mm.; fore femora, 8.5 mm.; hmd 

 femora, 14 mm. The color of this specimen is hghter than usual, 

 varying toward the unicolorously Hght-yellowish variety devius. 

 The pronotum is margined anteriorly and posteriorly with darker 

 color, as are also the meso- and metathorax posteriorly. 



1 Proc. Davenport Acad. Sci., vol. 9, 1902, p. 56. 



