CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 421 



0.66); II, 0.51(0.50-0.56); III, 0.59(0.53-0.63); IV, 0.81(0.76-0.90); 

 V, 1.10(1.00-1.20). Labial segments: I, 0.95(0.86-1.00); II, 1.23 

 (1.16-1.30); III, 1.32(1.26-1.40); IV, 0.84(0.83-0.90). 



Pronotum: Width-length ratio, 6.00(5.77-6.45) :3.25(2.85-3. 60). 



Sciitelliim: Length-width ratio, 3.59(3.45-3.75) :3. 51(3.30-3.75). 



Length of body: 10.95(10.20-11.70). 



Type data. — The type specimen (BrM) was listed by Dallas as from 

 Colombia. 



Specimens studied.- — -10 males, 6 females, 



Panama: Campana, Apr. 27, 1937, R. Bliss, 1 female (JCL). Canal Zone: 

 Ancon, Aug. 6, 1924, W. M. Wheeler, Cordia alliadora, 1 male (MCZ). Barro 

 Colorado Island, May 1, 1926, Van Tyne, 1 male (MCZ). No specific locality, 

 January-March 1944, Zetek, May 22, 1 male (USNM); January, Griswold, 1 

 male (MCZ); July-August 1942, J. Zetek, 1 female (USNM); June 24, 1924, 

 N. Banks, 1 female (MCZ). 



Colombia: Monteria, 6 males, 3 females. 



Discussion. — A male specimen (MCZ) bears the notation that it 

 had been collected on "Cordia alliadora." 



Genus Melanaethus Uhler, new status 



Geotomus of authors, not Mulsant and Rey, 1862, p. 324. 



Melanaethus Uhler, 1876, p. 280. 



Lobonotus Uhler, 1877, p. 395, (nee Milne-Edwards, 1863, p. 280, in Crustacea). 



New synonymy. 

 Lobolophus Bergroth, 1891, p. 235. New synonymy. 



DiAGNosis.^ — Among those genera in which the terminal lobe of the 

 peritrcme is developed into a short process, the members of this genus 

 may be recognized by the small size (3-6 mm.) and the more exten- 

 sively developed metapleural evaporatorium (figs. 96, 97). 



Description. — Small to moderately large, oval to elongate, great- 

 est width across humeri or across hemelytra posterior to midlength; 

 dorsum much less convex than venter. 



Head : As wide as or wider than long, flattened or slightly convex 

 above; juga as long as clypeus, variously curved, usually with fine 

 marginal carina dorsally; submargin with one setigerous puncture, 

 except in planifrons, which has three or four; eyes projecting by one- 

 fourth to three-fourths their width; ocelli present, on or behind line 

 connecting posterior margins of eyes; antennae 5-segmented, I short- 

 est, V usually longest, II, III, and IV varying in proportions; buc- 

 culae moderately to strongly elevated, highest posteriorly, posterior 

 end usually abruptly terminated (fig. 23); labium variable in length 

 according to species, reachmg from middle of mesosternum to basal 

 segments of abdomen, II longest, slightly compressed, without folia- 

 ceous lobe. 



