NO. 3533 CHALCID WASPS OF GENUS EURYTOMA — BUGBEE 437 



Explanation of Terms and Measurements 



Segmentation of the abdomen: Following well-established homol- 

 ogies the propodeum and the petiole are counted as the first two 

 segments of the abdomen. Thus the abdomen is considered to have 

 seven terga beyond the petiole, and the long tergum, often referred 

 to as the fourth, will be designated in this revision as the sixth. 



The ninth tergum (ninth abdominal segment) varies from elongate 

 and pointed to very short, broad, and stubby. Laterally, on each 

 side, is a small round cercus. 



Measurements of the ninth tergum have been made from the distal 

 tip to the proxunal Imiit of the chitinized area or to where the inter- 

 segmental membrane begins. In all cases the insect was viewed 

 laterally. Measm'ements of the length of the abdomen were made 

 from the same lateral view, from the distal tip of the ventral valves 

 to the proximal end of the abdomen where it joins the petiole; i.e., 

 the petiole is not included. The length of the sixth segment was 

 measured in lateral view from the posterior border of the fifth seg- 

 ment to the posterior edge of the sixth, unless otherwise stated. 



Female genitalia (fig. 4): The entu-e genitalia were dissected from 

 the abdomen and mounted in diaphane on glass shdes. Various 

 terms have been applied to the parts of the female genitalia of the 

 Chalcidoidea. In this paper the foUowmg terminology is used. The 

 dorsal valves represent the ninth abdominal tergum, which consists 

 proximally of two parts that fuse together distaUy to form the exposed 

 tip of the ninth tergum. The ventral valves, designated as the 

 gonoplac (Scudder, 1961) or third valvula (Snodgrass, 1935), lie 

 internal to and extend distaUy beyond the dorsal valves. Proximally 

 the ventral valves expand into a broad plate that bends dorsally or, 

 sometimes, posteriorly. The fulcral plates, called the gonangulum 

 (Scudder, 1961) or anterior plate (Snodgrass, 1935), are two rectan- 

 gular-shaped parts that articulate at their proximal ends with the 

 dorsal extension of the ventral valves, and along then- anterior ventral 

 margin with the proximal ends of the dorsal valves. Stylet arch is 

 formed by the bendmg of the stylets dorsaUy, posteriorly, and finally 

 ventraUy to the point where they attach to the distal end of the 

 fulcral plates. Depending upon the degree of dorsal extension of the 

 ventral valves, the stylet arch may be in a horizontal, oblique, or 

 vertical plane. 



Petiole: The second abdominal segment connecting the abdomen 

 to the propodeum. 



Propodeum (fig. 3): The first abdominal segment fused with 

 the thorax (Snodgrass, 1911). Viewed from the posterior of the 

 thorax, the propodeum in most species is concave. In the center of 



