CYDNIDAE OF THE WESTERN HEMISPHERE FROESCHNER 447 



scutellum to have uniform, close-set punctures. Actually the punc- 

 tures of the scutellum are of two sizes and are irregularly scattered. 



Perhaps collectors in British Columbia and coastal Alaska will 

 rediscover this species in nature and tell us something of its habits. 



Melanaethus robustus Uhler, revived combination 



Plate figures 13, 23, 50, 96, 120, 144, 215 



Melanaethus robustus Uhler, 1877, p. 390; 1886, p. 3. 

 Geotomus (Melanaethus) robustus Signoret, 1883, p. 59, pi. 4, fig. 168. 

 Geotomus robustus Lethierry and Severin, 1893, p. 73. — Banks, 1910, p. 100. — 

 Van Duzee, 1917, p. 22.— Torre Bueno, 1939, p. 181. 



Diagnosis. — The coarse, close punctation of the head, the inter- 

 mixed coarse and fine punctation of the posterior pronotal lobe and 

 the large size (3.6-4.2) will readily separate this species from all others 

 of the genus that exhibit the large terminal modification of the 

 peritreme. 



Description. — Male: Broadly oval, widest behind midlength. 



Head: Length three-fourths width, 0.62(0.60-0.65) :0.88(0.86-0.93); 

 interocular width, 0.63(0.61-0.66); anterior outhne semicircular, 

 clypeus as long as or very slightly longer than juga, scarcely nar- 

 rowed apically; surface shining (fig. 50), with numerous coarse punc- 

 tures, many of them contiguous witli distinct marginal carina dorsally, 

 with one setigerous puncture submarginally; ocelli very small, far 

 behind line connecting posterior margins of eyes, removed from eyes 

 by space greater than four times transverse ocellar width; jugum 

 ventrally shining, impunctate; maxillary plate rugopunctate. An- 

 tennal segments: I, 0.16(0.15-0.20); II, 0.15(0.15-0.16); III, 0.19(0.17- 

 0.23); IV, 0.25(0.23-0.27); V, 0.38(0.36-0.40). Bucculae (fig. 23) 

 higher than labial II, abruptly terminated posteriorly; labium attain- 

 ing middle coxae. Labial segments: I, 0.24(0.24-0.26); II, 0.50(0.47- 

 0.53); III, 0.37(0.35-0.40); IV, 0.25(0.23-0.30). 



Pronotum: Length less than half width, 0.97(0.93-1.03) :2.01 (1.96- 

 2.08); anterior margin moderately, singly emarginate; lateral margin 

 straight on basal half, without submarginal setigerous punctures; 

 transverse impression obsolete, sometimes absent medially, not 

 marked by special row of punctures; anterior lobe, except calli and 

 their anterior projection into the lateroapical angles, with numerous 

 moderate to coarse, closely crowded punctures, calli with few minute 

 punctures; transverse impression and posterior lobe very closely 

 punctate laterally, discally with numerous fine punctures and few to 

 many coarse ones intermixed. 



Scutellum: Length greater than width, 1.31(1.29-1.33):!. 19(1. 17- 

 1.23); shining, surface, except basal angles, with numerous coarse 



