88 Journal New York Entomological Society, |V<,i xl 



6. Head transverse, convex in front, the ocelli arranged in a triangle, the lateral 



close to the eye margin ; wings not banded, ciliated ; club of antennae 4-jointed. 



Tiphodytes Brat^/ey ^Limnodytes Marchal. 



(type L. gerripluii^tis Marchal). 



Head large, flat, the ocelli in a triangle, the lateral nearer to the front ocellus 



than to the eye margin ; wings banded AradophagUS Ashtnead. 



( type A. fasciatus AsHM. ). 



7. Lateral ocelli not touching the eye margin (?) fiemisius M'esttu. 



Lateral ocelli touching the eye margin. 



Mesonotum without parapsidal furrows 8 



Mesonotum with parapsidal furrows. 



Postscutellum spined Trimorus Forster. 



8. Head transverse, often very broad ; abdomen oblong-oval or broadly oval 9. 



Head quadrate Phanurus Thomson 



9. Pedicel clavate ; first joint of the flagellum longer than the second, the latter 



longer than the third Telenomus Haliday. 



Pedicel oblong; first joint of the flagellum the longest joint, the second shorter 

 than the third Tiphodytes j5r<7(//iy'= Limnodytes Marchal. 



Subfamily II. B.EIN.^. 

 This group was iirst recognized by the author as a tribe, but is now 

 elevated to subfamily rank. To it belong some of the smallest Hy- 

 menoptera, the majority rarely attaining a millimeter in length, and 

 all of them seem to be parasitic only in the eggs of various spiders 

 (Arachnida). 



Table of Genera. 



1. Females 2 



Males 9 



2. Apterous forms 3 



Winged 6 



3. Scutellum distinct 4 



Scutellum wanting Basus Haliday (type B. sei/iinulu7n Haliday). 



4. Mesonotum without furrows ; lateral ocelli close the eye margin. 



Basal segment of abdomen normal, without a horn 5 



Basal segment of abomen a with horn Ceratobaeus Ashmead. 



(type C. eormtlus ASHM.). 



5. First abdominal segment as broad as the metathorax and only visbile as a trans- 



verse line ; face with an antennal furrow, the occiput concave, the superior 



margin sharp ; mandibles bidentate Acolus FoRSTER 



(type A. opacits Thoms. ). 



First abdominal segment subpetiolate, much narrower than the metathorax ; face 



not or only slightly impressed, the superior margin of the occiput rounded ; 



mandibles tridentate Acoloides Ho-cvard (type A. saitidis How.). 



6. Basal segment of abdomen normal, without a horn 7 



Basal segment of abdomen with a horn. 



Mesonotum without furrows CeratobaeUS Ashmead. 



