190 
Psyche 
[Vol. 94 
Materials and Methods 
Collections and their abbreviations are given in the acknowledg- 
ments. 
The morphological terminology used in this paper is mostly that 
of Shaw (in press). Microsculpture terminology is that of Harris 
(1979). Measurements and ratios are those used by Naumann (1985, 
in press). Body length (BL) is measured in dorsal view, excluding the 
antennae and ovipositor. Forewing length (FWL) is measured from 
the tegula to wing apex. Ovipositor length (OL) is measured from 
the apex of the hypopygium. Shape of the head is expressed as a 
ratio of head width (HW) to head length (HL), measured in dorsal 
view. Size and position of the ocelli is expressed by the ratio of 
distance between the lateral ocelli (POL) to the distance between 
compound eye and lateral ocellus (OOL), and the ratio of the max- 
imum diameter of a lateral ocellus (OD) relative to the distance 
between lateral ocelli (POL). Size of the compound eye is expressed 
as a ratio of maximum diameter of the compound eye (MAE) rela- 
tive to the width of the frons (FW), measured as the minimum 
distance between the compound eyes. Size and shape of the antenna 
is expressed as flagellar length/ width ratios (F1L/F1W, etc.) 
Mesoscutum shape is expressed by a length/ width ratio (MTL/ 
MTW), and by the ratio of metasoma length relative to body length 
(MTS/BL). 
Family Megalyridae 
Diagnosis: Flagellum 12-segmented; subantennal groove present; 
mesoscutum usually with a median sulcus (absent in one oriental 
genus, but always present in neotropical species); pronotum with the 
mesothoracic spiracle completely surrounded by pronotal cuticle; 
hind wing venation reduced, Sc+R leading to R1 and Rs (as in Figs. 
4-6). 
Key to Neotropical Megalyridae (Females) 
1. Ocular carina absent (Figs. 1-2); apical segment of Rs in fore- 
wing indicated only by spectral venation, not sclerotized and 
tubular to wing margin (Figs. 4-5) 2 
Ocular carina present (Fig. 3); apical segment of Rs in forewing 
sclerotized and tubular to wing margin (Fig. 6) 
Neo dinap sis peckorum Shaw 
