170 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



The difterence between the two genera, as here uiuler.stodd, i.. suffi- 

 ciently Inought out in my table, and I must leave to others the thank- 

 less task, by the inspection of the type, if it is still in existence, of the 

 proper identification of Forster's o-euus. 



Mr. Howard's genus is parasitic on spiders. The species may be 

 synoptically represented as follow^s : 



TABLE OF SPECIES. 



Wingless or subapteroiis speciea 3 



WiiigeJ. 



Species not entirely black 2 



Species, except sometimes the base of the abdomen, entirely black. 

 Opa(ine, closely, minntelj' punctate. 

 Thorax and scntelhim flat. 



Antenna^ and legs, except coxiu, yellow A. saitidls How. 



Lustrous, but still microscopically punctulate. 

 'i'horax and scutellum more convex. 



First and second abdominal segments striate. 



Petiole pale rufous or yellowish A. HoWARPil, sp. uov. 



Petiole and base of abdomen yellowish A. Emertoxii How. 



2. Head and thorax black, microscopically punctate. 



Abdomen at base and disks of two ov three of the following segments, yellow. 



A, Emertonii How. 

 Abdomen yellow, the third segment across the )»ase and the two apical segments 



fuscous A. lUCOLOR, sp. nov. 



Wholly honey-yellow, eyes and ocelli, black or brown A. mellei'S, sp. nov. 



8. Head and thorax black, subopaque. 



With wing scales; abdomen black, sericeous, the petiole yellow. 



A. SI'HAPTERUS, sp. UOV. 



Without wing scales; abdomen brownish-yellow A. semixiger, sp. nov. 



Acoloides saitidls How. 

 Ins. Life, ii, p. 270, fig. .58; loc. cit., p. 359. 



"9. Length, 1.4"""; expanse, 3.G"""; greatest width of fore wing, 

 0.40"'"'. Antenuic short; pedi(!el long, nearly one-half the length of 

 scape; joint J of funicle one half as long as pedicel; Joints 2, 3, and 4 

 very short ; club ^'e^y large, oval, and one-third longer than four preced- 

 ing joints together; no articulations can be distinguished, but it is homo- 

 logically composed of six joints. Eyes hairy; lateral ocelli touching 

 the eye margin. Head, face, and mevsonotnm densely and linely punc- 

 tate; parapsidal furrow\s not present; first and second abdominal seg- 

 ments with fine, close, longitudinal stria^, wanting at smooth i>osterior 

 border; the very large third segment and short fourth, densely and 

 finely punctate, and clothed irregularly with short, whitish pile, which 

 is also present, although sparser, upon the mesonotum, and is (piite 

 thick on the vertex; mesopleura finely punctate below; metapleura 

 smooth. The marginal vein is very short, and not quite coincident 

 with costa; the post marginal is extremely short; the stigmal is long 

 and slender, and terminated by a small rounded knob. General color 



