132 Annals Entomological Society of America [Vol. V, 
Paratypes (except brachypterous form) in the Bussey In- 
stitution, Harvard University. 
The breeding labels show that the majority of these hatched 
out during the latter part of February, March and the first half 
of April, extra notes were given on three labels as follows: 
1. ‘‘From egg capsule of Prosthesima sp. Twining City, Md. iss. Dec. 28th, 1897. 
A. Busck coll.’’ 
The pin bore two wingless males. 
2. ‘‘9 iss. Feb. 22, 1898, laid same date one egg unfertilized. From this the @ 
issued April 21, 1898. A. B.”’ 
The pin bore 1 9 and 1 fully winged &. 
3. ‘'® issued Feb. 11, 1898. Oviposited unfertilized; male from the eggs issued 
April 20, 1898. A. B.”’ 
The pin bore one 2 and one fully winged <. 
This appears to be the only case of dimorphism in @ Pezo- 
machini as yet noticed in this country, but there can be no 
doubt that this is perfectly valid, and it is probable that similar 
conditions will be found to exist in others of the species already 
described in one form, or in both forms under different names. 
The condition of small mesothoracic wings being present, 
while the metathoracic wings are entirely suppressed as found 
in the intermediate form, is almost unique in the Hymenoptera. 
As far as I am aware the only analagous case is seen in ants. 
Professor Wheeler (Ants, their Structure, Development and 
Behavior, pp. 99 and 102) described and figures abnormal ant 
workers and solders, which he terms Pterergates in which meso- 
thoracic wing rudiments have developed. In the Braconide, 
Chalcidoidea and Proctotrypoidea where forms with rudimen- 
tary wings are occasionally met with, and the mesothoracic 
wings are often reduced far more than in the species under con- 
sideration, it is always found that metathoracic wings are 
also present. 
A Hemiteles sp. (hyperparasite ?) was in several instances 
bred out from the same egg capsules as this species. 
Pezomachus manni sp. nov. 
Male. Length 4mm. Wingless. Head, thorax and petiole ferrug- 
inous, remainder of abdomen black. Antenne and legs piceous. 
Head from above dusky ferruginous, finely rugose and with a very 
sparse pubescence. The small lateral ocelli are a little nearer to the 
median ocellus than to the eye margins. Antennz piceous reaching to 
about the apex of the second abdominal segment, about 27-jointed, 
seventh and neighboring flagellar joints twice as long as thick. Face 
below antenne ferruginous, malar lines distinct, short, hardly more 
than 14 as long as the face is wide at the lower angles of the eyes. 
Clypeus transverse, truncate. Palpi dusky. 
