468 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iii 



Terminalia: Genital capsule weakly alutaceous, closely punctate in 

 lateral angle, apical margin straight; gonostylus as illustrated (fig. 

 219). 



Length of body: 4.80(4.42-5.20). 



Female: Similar to male, measurements averaging slightly larger. 



Head: Length-width ratio, 0.88(0.86-0.93): 1.37(1.33-1.40); inter- 

 ocular width, 0.93(0.90-0.96). Antennal segments: I, 0.26(0.26- 

 0.26); II, 0.21(0.20-0.23); III, 0.30(0.28-0.31); IV, 0.29(0.26-0.33); 

 V, 0.35(0.33-0.36). Labial segments: I, 0.41(0.40-0.44); II, 0.55(0.53- 

 0.56); III, 0.44(0.41-0.50); IV, 0.32(0.30-0.33). 



Pronotum: Length-width ratio, 1.50 (1.43-1.56) : 2.95(2.86-3.00). 



ScuteUum: Length-width ratio, 1.82(1.75-1.89) : 1.82(1.75-1.89). 



Length of body: 4.96(4.85-5.14). 



Type DATA.— The types (USNM) were described by Uhler (1877, 

 p. 378) from the vicinity of Denver City, Colo., and Dallas Co., Tex. 

 The location of the type of Signoret's Homaloporus pangaeiformis is 

 unknown to the author, but the species was described from "Mexique." 

 The locality of the type specimen (Wien) of Aethus ferrugineus 

 Signoret (1882, p. 40) was also given as "Mexique." 



Specimens studied. — 18 males, 21 females, 1 third-instar nymph. 



United States: Arizona: Oak Creek, December. California: Laguna Beach, 

 Lone Pine, Los Angeles, Riverdale, San Diego, Santa Cruz, Wilmington; April 

 to August. Colorado: Cortez, Cottonwood, Denver, Fort Collins, Palisades, 

 Salida; April to July, October, third instar nymphs in July. Kansas: Greeley 

 Co., Thomas Co. New Mexico: Estancia, Mesilla Park, Santa Fe Co.; July, 

 August. Utah: Brigham, St. George; February, August. 



Mexico: Dislrito Federal: Guadalupe Hidalgo; July. Mtcico: Amecameca. 



Discussion: The type of Homaloporus 'pangaeiformis Signoret has 

 not yet been located, but the author feels no misgivings about assign- 

 ing the name to synonyxny. Considering first Signoret's comparison 

 of this with congruus, the more oval and broader form that he ascribes 

 to pangaeiformis may be a sexual difference, but in the series of 

 congruus at hand there was noticeable variation in robustness of both 

 sexes sufiicient to include Signoret's figures (47 and 48) of both species. 

 The descriptive statement that the mesopleuron has no shinmg space 

 between the evaporatorium and the posterior margin of the segment 

 is not borne out by the figure, which shows that area to have a dif- 

 ferent surface texture. Another feature that he listed, the evanescent, 

 acute apex of the peritreme, appears to have no specific value in this 

 genus as it occurs on North American material almost as freely as 

 does the abrupt termination. The other differences mentioned are 

 definitely not of specific value here. But returning to Signoret's 

 Illustration (fig. 48) of the mesopleuron and metapleuron of H. 

 pangaeiformis, one notices that something is amiss as the osteolar 



