70 
Psyche 
[June 
collected is a narrow 16 acre tract, extending from the 
beachgrass-lined bay inland 0.4 mile to U.S. Route 6 in 
East Brewster, Mass. One fourth of the land bordering the 
beach is characterized by Hudsonia-\medi sand-blows dotted 
with red pine, while the adjoining fourth is overgrown 
swamp. The remaining eight acres are largely open fields, 
supporting an occasional red cedar and bordered with 
clumps of bayberry and beach-plum. The cone-heads were 
confined to the beachgrass and open fields, although one or 
two specimens were taken in the bayberry bushes. Because 
of their alertness and habit of dropping from the tops of 
grasses and shrubs into inaccessible tangles below, the 
most practical collecting method is that of night-stalking. 
In early evening the ear-splitting, cicada-like song of a male 
is pin-pointed, then approached upwind; with careful man- 
euvering the singing insect may be spotted and grabbed or 
tricked into a ready net. Thus the taking of females is limit- 
ed to chance sightings or association with singing males. 
In this manner eight males were collected in the eight 
acre tract between 15 and 17 August, 1951; six were 
parasitized. On 3 August, 1952, seven males were para- 
sitized of ten collected in the same area; three unparasitized 
males came from the beachgrass section. From the number 
of individual songs noted, probably at least 75 per cent 
of the male population in the tract were taken each season. 
The incidence of parasitism in this area, of the males at 
least, is certainly much higher than the one to five per cent 
Explanation of Plate 4 
Euphasiopteryx brevicornis (Tns.) . Fig. 1, left half, ventral aspect 
of 0.8 mm first instar larva; right half, dorsal aspect. Fig. 2, left lateral 
view cf same, spines omitted. Fig. 3, detail of larval hooks. Fig. 4, first 
instar cephalopharyngeal skeleton. Fig. 5, 1.3 mm first instar larva after 
feeding. Fig. 6, nearly mature, 10 mm larva. An, anus. Fig. 7, posterior 
view of 8 mm puparium. Fig. 8, right lateral view of same. Fig. 9, detail 
of mature larval spiracular plate (x44). Fig. 10, detail of second instar 
spiracular plate (x457). Fig. 11, abdominal cutaway of the host, 
Neoconocephalus r. rohustus, showing larval respiratory funnels in 
place; lower funnel was ruptured by escaping larva (xl3) . Fig. 12, 
longitudinal section of funnel showing larval posterior in place (dotted) ; 
Ex, first instar exuviae embedded in funnel wall (x40). 
