560 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



peritreme extending more than half way across segment, becoming 

 evanescent apically. 



Legs: Moderately long, not unusually modified. 



Sternites: Polished, impunctate or with a few fine punctures later- 

 ally. 



Terminalia: As illustrated (fig. 253). 



Length of body: 8.54. 



Female: Two specimens. Similar to male, except sometimes the 

 outer row of punctures paralleling claval suture is incomplete; meas- 

 urements larger. 



Head: Length-width ratio, 1.43(1.43-1.43) :2.25(2.22-2.28); inter- 

 ocular width, 1.50(1.50-1.51). Antennal segments: I, 0.58(0.56- 

 0.60); II, 0.54(0.53-0.56); III, 0.57(0.53-0.61); IV, 0.75(0.72-0.78); 

 V, 0.78(??-0.78). Labial segments: I, 0.98(0.93-1.04); II, 1.28(1.23- 

 1.33); III, 1.01(0.93-1.10); IV, 0.81(0.80-0.83). 



Pronotum: Length-width ratio, 2.97(2.95-2.99) : 5.46(5.38-5.55). 



Scutellum: Length-width ratio, 3.45(3.29-3.61): 3.53(3.44-3.61). 



Length of body: 9.64(9.38-9.90). 



Type data. — The two specimens (Wien) on which Signoret based 

 his original description were loaned for study. They are in a somewhat 

 poor condition but clearly recognizable. The specimen from Mexico 

 bearing the type label is here designated lectotype. The other speci- 

 men is labeled "Guatemala, Escuintla." On both specimens the trivial 

 name begins with the letter "R" instead of the "H" which appeared in 

 the original citation. The type localities as given with the original 

 description were simply "Guatemala, Mexico". 



Specimens studied.— 2 males, 3 females. 



Mexico: No exact localities: 1 male (USNM), 1 male (Wien). Colima: 2 

 females (USNM). 



Guatemala: Escuintla, 1 female (Wien). 



Discussion. — ^Each of the three nontype specimens examined had 

 been determined by a different worker, but all were labeled "Aethus 

 hogenhoferi." 



The present author considers the use of the initial "R" in the trivial 

 name by Lethierry and Severin an unnecessary emendation from the 

 letter "H" which appeared in the original description. 



Tominotus impuncticollis (Distant), new combination 



Plate figures 82, 254 



Pangaeus impuncticollis Distant, 1880, p. 7, pi. 3, fig. 7. 

 Aethus impuncticollis Signoret, 1881b, p. 428, pi. 12, fig. 57. 

 Cydnus impuncticollis Lethierry and Severin, 1893, p. 66. 



Diagnosis. — This species may be recognized by the broad scutellar 

 apex and the absence of distinct punctures laterally on pronotal disc. 



