412 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



Key to the known species of Ectinopus 



1. Antennal III less than three-fourth (70%) as long as II. 



muticus, new species (p. 413) 

 Antennal III at least four-fifths as long as II 2 



2. Head with numerous (15 or more) moderate punctures on either side anterior 



to ocellus; scutellum strongly punctured into basal fourth, sunken punctures 

 of disc confluent transversely, forming transverse rugae (fig. 66). 



rugoscutum Signoret (p. 414) 

 Head impunctate or with very few scattered, very fine punctures; scutellum 

 virtually devoid of punctures in tumid basal fourth. 



holomelas (Burmeister)(p. 412) 



Ectinopus holomelas (Burmeister) 



Plate figures 15, 22, 100, 126, 145, 182, 201 



Cydnus holomelas Burmeister, 1835, p. 375. 



Ectinopus holomelas Dallas, 1851, p. 122.— St&l, 1862, p. 96; 1876, p. 20.— 

 Walker, 1867, p. 164.— Distant, 1880, p. 8.— Signoret, 1881b, p. 320, pi. 10, 

 fig. 42. — Uhler, 1886, p. 3. — Lethierry and Severin, 1893, p. 64. 



Aethus fusiformis Walker, 1867, p. 150. 



Pangaeus 1 fusiformis Uhler, 1877, p. 389. 



Ectinopus opacus Distant, 1900, p. 688. New synonymy. 



Diagnosis. — This species may be differentiated from its congenitors 

 by the lack of punctures on the basal fourth of the scutellum plus the 

 lack of an impressed line extending laterally from apex of peritreme. 



Description. — Male : 



Head: Length more than half of width, 1.81(1.69-1.98) :2.62(2.57- 

 2.93); interocular width, 1.63(1.49-1.69); anterior outline a shallow 

 semicircle; surface unpunctate, with a few radiating rugae submar- 

 ginally. Antennal segments: I, 0.49(0.46-0.56); II, 0.88(0.80-0.97); 

 III, 0.71(0.66-0.90); IV, 1.27(1.13-1.33); V, 1.41(1.20-1.60). Labial 

 segments: I, 1.01(0.86-1.23); II, 1.39(1.23-1.60); III, 1.19(1.10- 

 1.30); IV, 0.89(0.83-0.96). 



Pronotum: Length slightly more than half of width, 3.23(2.87- 

 3.44) :6. 14(5.72-6.49); transverse impression with an irregular baud 

 of a few, mostly widely separated punctures; anterior lobe with or 

 without a series of punctures paralleling anterior cmargination and 

 with numerous crowded punctures laterally. 



Scutellum: Usually wider than long, 3.99(3.76-4.20) :3.81 (3.45- 

 4.05); discally with a scattering of a few punctures often present 

 almost to apex. 



Proplem'on and mesopleuron: As in generic description. 



Metapleuron: As in generic description (fig. 100), without an 

 impressed line extending laterally from apex of peritreme. 



Terminalia: Genital capsule alutaceous, with few scattered, weak 

 punctures, apical margin not or only weakly sinuate; gonostylus as 

 illustrated (fig. 201). 



