CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 551 



Pronotum: Width-length ratio, 3.00:1.43. 



Scutellum: Length-width ratio, 2.28:2.06. 



Length of bod}^: 5.G8. 



Type data. — Holotype male (CalAc,926), and allotype female 

 (CalAc, 927), Pasadena, Calif., Oct. 12, 1916, "one pair taken among 

 ants under a stone" (Van Duzee, 1922, p. 271). 



Specimens studied: 2 males, 1 female. 



United States: California: Greenhorn Mt., Kern Co., June 17, 1930, 1 male 

 (KU). Los Angeles, Coquillett, 1 male (USNM). 

 Mexico: "S.W. Mex.," 1 female (USNM). 



Discussion.— Further comments given by Van Duzee with the 

 original description carry the information that the three paratypes 

 had also been taken "under stones," and that he believed that "This 

 species undoubtedly is an inhabitant of ants' nests and may be com- 

 mon in such situations." 



Toniinotus communis (Uhler), new combination 



Plate figures 54, 55, 72, 79, 250 



Aelhus communis Uhler, 1877, p. 379; 1886, p. 3.— Signoret, 1882, p. 35, pi. 2, 

 fig. 76.— Van Duzee, 1917, p. 20.— Barber and Bruner, 1932, p. 235.— Torre 

 Bueno, 1939, p. 179. 



Aethus politus Signoret, 1882, p. 36, pi. 2, fig. 77.— Uhler, 1886, p. 3.— Van 

 Duzee, 1917, p. 20. — Torre Bueno, 1939, p. 179. New synonymy. 



Cydnus communis Lethierry and Severin, 1893, p. 65. — Banks, 1910, p. 99. 



Cydnus politus Lethierry and Severin, 1893, p. 67.— Banks, 1910, p. 99. 



Diagnosis. — The moderate size (5.14-7.22), narrowed scutellar 

 apex, and polished dorsum will separate this species from its congeners. 



Description. — Male: Oval. 



Head: Length more than half width, 1.02(0.93-1.10): 1.62(1.43- 

 1.75); interocular width, 1.04(0.91-1.13); jugum rounded, forming a 

 semicircle or flattened semicircle (figs. 54, 55) (see Discussion), as 

 long as clypeus, latter with two subapical setigerous punctures; jugum 

 with a complete, submarginal, depressed row of setigerous punctures 

 giving rise to a row of stout pegs and several long ciha; surface slightly 

 convex, sometimes longitudinally depressed just mesad of eyes, 

 neither punctate nor rugose; ocelli well-developed, separated from 

 eyes by a space slightly more than an ocellar width; jugum ventrally 

 impunctate; maxillary plate impunctate except for several coarse, 

 very close-set punctures posteriori};. Antennal segments: I, 0.33 

 (0.30-0.36); II, 0.38(0.30-0.46); III, 0.33(0.30-0.38); IV, 0.41(0.36- 

 0.51) ; V, 0.50(0.46-0.56). Bucculae much lower than labial II, evanes- 

 cent posteriorly; labium very slightly surpassing middle coxae. 

 Labial segments: I, 0.68(0.60-0.72); II, 0.84(0.73-0.99); III, 0.74 

 (0.66-0.80) ; IV, 0.57(0.46-0.63). 



