144 
Psyche 
[December 
Very young larva: Length about 0.84 mm. Hairs rela- 
tively longer; head and postanal lip relatively larger. 
Otherwise very similar to mature larva. 
Material studied: two dozen larvae from Cuba, collected 
by E. 0. Wilson; courtesy of Dr. W. L. Brown. 
Smithistruma rostrata (Emery) 
Young larva: Length about 1.4 mm. Generally similar 
to talpa except in the following details: Head relatively 
larger. Anchor-tipped body hairs longer (about 0.14 mm). 
Antennae moderately large. Anterior surface of each lobe 
of the labrum with four sensilla and a few oblique rows 
of minute spinules. Labial palp with five sensilla. (Mater- 
ial studied: two dozen larvae from Illinois; courtesy of 
Dr. W. L. Brown.) 
Wilson, 1953: “Essentially similar to Trichoscapa mem- 
branifera in details of . . . larval feeding and in the total 
absence of trophallaxis” (p. 485). The life cycle was found 
to be: egg, 9 days; larva, 31 days; pupa, 19 days (p. 491). 
Smithistruma schulzi (Emery) 
Length about 1.7 mm. Similar to talpa but differing in 
the following details:. Anchor-tipped body hairs longer 
(about 0.14 mm) and occurring on abdominal somites I-IV 
only. Head hairs shorter (0.027-0.054 mm). Anterior sur- 
face of each lobe of the labrum with four sensilla. Man- 
dibles rather small. (Material studied: three larvae from 
Brazil.) 
Smithistruma studiosi (Weber) 
Apparently similar to talpa. (Material studied: three 
damaged specimens from Costa Rica.) 
Smithistruma {W essonistruma) pergandei (Emery) 
Immature larva: Length about 1.6 mm. Similar to 
talpa, except in the following details: Body hairs — (1) 
slightly longer (0.027-0.1 mm) ; (2) longer (0.045-0.1 
mm); (3) considerably longer (about 0.17 mm). Head 
hairs shorter (0.036-0.054 mm). Mandibles more slender. 
(Material studied: seven larvae from Virginia; courtesy of 
Dr. W. L. Brown.) 
