4 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
The “preocular slit” is an emargination with approximately equal 
and parallel margins in the dorsal-lateral margin of the head immedi- 
ately anterior to the eye (figs. 23, 24). 
The “preocular notch” is a similar emargination with triangular 
or semicircular margins (figs. 25, 26, 64-69). 
The “metasternal plate’ on the metasternum was first described 
by Bedford (1920) as a 4-sided plate which was normally expanded 
anteriorly (figs. 26c, 64c, 66c, 68c, 70). 
The male and female each possess a complete complement of 
abdominal segments from the first to the tenth (Cope, 1941). 
The “pleurites” (“paratergal plates’”’ of some authors) are sclerites 
which pass around the lateral margin of the abdomen and are sepa- 
rated from the tergites and sternites by clear divisions (Clay, 1954) 
(figs. 23, 24). 
The ‘“postspiracular seta’? on each side of abdominal tergites 
IIJ-VIII is posterior to the spiracle and is always associated with 
two small setae, the alveoli of the three setae being contiguous (Clay, 
1954). A similar group of three setae is present on abdominal tergite 
II, although there is no functional spiracle on this tergite. In most 
Amblycera the postspiracular setae are the most laterad setae of the 
posterior marginal row (fig. 25p). 
The “male terminal abdominal tergites’” IX and X are almost 
completely fused. ‘Abdominal sternite VIII” is fragmented into 
two parts which have moved laterad. ‘Abdominal sternite IX” 
strengthens the anterior lip of the genital and anal opening (cloaca), 
and there is no apparent tenth sternite (Cope, 1941). 
The “basal plate” (“basal apodeme” of Clay, 1956) of the “male 
genitalia” supports posteriorly the slender ‘“‘parameres” laterally and 
the ‘“endomeres” centrally (Ewing, 1927). 
The “sclerite of the male genital sac” is the sclerite on the walls 
of the genital sac which is articulated to the basal plate (Clay, 1956) 
(figs. 18s, 19s). 
The “lateral horns” of the ‘‘male genitalia” are structures on each 
side of the large, curved, platelike ‘“endomeres” (Ewing, 1927) (figs. | 
1-3, 6, 7). 
The “female terminal abdominal tergites’’ IX and X are single 
plates. ‘Abdominal sternite VIII” has a pair of gonopods, lying 
side by side medially, which are fused at their apices to cover the 
genital opening (vulva) between segments VIII and IX, and on each 
lateral side of the gonopods is a fragment of sternite VIII (Cope, 1941). 
The “internal sclerite of female abdominal sternite VIII’’ appears 
to be the sclerite that Clay (1961) calls the internal structure of the 
female genital chamber (figs. 35i, 38i, 391, 491). 
“Sclerital hooks” are hooklike processes in the female arising on — 
