348 MEMOIES OF THE CARNEGIE MUSEUM 



longitudinal grooved lines, rarely five, but never less than two longitudinal grooved 

 lines. 



The species falhng in this group are not restricted in their habits, but attack 

 nearly all orders of insects. They have been bred, according to the records, from 

 the larvEe of Coleoptera, Lepidoptera, Hymenoptera, Diptera, Orthoptera, Neurop- 

 tera, Odonata, etc., and appear to be both primary and secondary parasites. 



The vast majority of them, however, appear to be primary parasites upon the 

 gall-making or gall-inhabiting insects in the Orders Diptera, Hymenoptera and 

 Coleoptera. 



The curious, and in some respects anomalous, genus Melittobia Westwood is para- 

 sitic in the nests of bees and wasps, and is said to attack not only these insects but 

 also other hymenopterous parasites of the bees and the wasps, i. e., Monodontomerus, 

 etc. In this country species have been bred from the nests of bees and wasps, just 

 as in Europe, but here we have positive evidence that they came from the puparium 

 of a Dipteron, and I have, therefore, my doubts as to the genus being a primary 

 parasite (;f bees and wasps. 



TABLE OF GENERA. 



1. Females 2 



Males 13 



2. Mesonotum without a median grooved line 3 



Mesonotum with a median grooved line 7 



3. Pronotum transverse, not conical, or subquadrate or rounded anteriorly 4 



Pronotum long, conical. 



Aiitenuje 9-joiuted, inserted near the mouth border ; abdomen longer than the head and thorax 



united, subcompressed, the ventral valve prominent Melittobia Westwood 



(type Cirrospilus acasta Walk.). 



4. Antennae 9-jointed, with one ring-joint 6 



Antennae 10-jointed, with tiuo ring-joints. 



Abdomen very long, conically produced, two or more times longer than head and thorax 



united 5 



Abdomen not -long, either ovate or conic-ovate and not or rarely much longer than the head 

 and thorax united. 



Abdomen above depressed or concave, never cylindrical, either carinate or convex be 



neath, polished, the segments not subequal Tetrastichodes Ashmead 



(type T. floridanus Ashm.). 



Abdomen cylindrical, convex above, never depressed, shagreened or punctate, never 



smooth, the segments subequal ; funicle joints cylindrical, at least twice as long as 



thick Trichoporus Forster (tyije unknown). 



5. Metanotum usually very short, with a A-shaped median carina, each fork diverging towards the lateral 



hind angle, more rarely with a straight median carina Hyperteles Forster 



(type Eulophus elongatus Forster). 



