170 miLLICTIN 45, UNITKl) STATES NATIONAL MUSEUM. 



Till' diflereiu;*' bi'twrt'ii tiie two jicneia, as hew ini(k'i'.st<)<Ml, is .suftl- 

 fiently brought out in my tjiblc, and I iiuist lejivo to otlieis the thank- 

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

 proper identification of Fiirster's <j»'nus. 



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

 syuoptically represented as follows: 



TABLE OF SPECIES. 



Wingless or subapterous HpiM-ies 3 



Winged. 



Spetit's not eutinly Mack 2 



SjiecieH, «\\cej»t sometimes the base of the abdomen, entirely black. 

 <)l»iiiine, closely, minutely punctate. 

 Tliorax and 8<utellum flat. 



Antenme and legs, except coxa', yellow A. saituhh How. 



Lustrous, but still microscopically pnnctnlate. 

 Thorax and scutellum more convex. 



First and second abdominal segments striat*'. 



Petiole pale rufous or yellowish A. Howakiui, sp. nov. 



Petiole and base of abdomen yellowish A. Emkrtonii How. 



2. Head and thorax black, micros<^oi)ically punctate. 



Abdonu-n at base and disks of two or three of the following segments, yellow. 



A, Emkrtonii How. 

 Abdomen yellow, the third segment across the base and the two apical segments 



fuscous A. Hicoi-oR, sp. nov. 



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



3. Head and thorax black, subopa<|ue. 



With wing scales; alulomcn black, sericeous, the jietiole yellow. 



A. srnAi'TKRi's, sp. nov. 

 Witliout wing scales; abdomen brownish-yellow A. skmixic.kr, s]>. nov. 



Acoloides saitidis How. 

 Iu8. Life, II. p. 270, tig. 58; loc. cit., p. 359. 



"9. Length, 1.4'"'"; expanse, 3.(>'"'"; greatest width of fore wing, 

 0.40'"'". Antenme short; pedicel long, nearly one-half the length of 

 scape; joint 1 of funicle one-half as long as pedicel; joints 2, 3, and 4 

 very short ; club very large, oval, and one-third longer than four preced- 

 ing joints together; no articulations can be distingui.shed, but it is liomo- 

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

 the eye margin. Head, face, and mesonotum densely and finely punc- 

 tate; i^arapsidal furrows not present; first and second abdominal seg- 

 ments with fine, close, longitudinal striai, wanting at smooth jmsterior 

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

 finely punctate, and clothed irregularly with short, whitish i>ile, which 

 is also present, although sparser, upon the mesonotum, and is quite 

 thick im 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 



