562 Mr. D. Sharp and Mr. F. Muir on the Comparative 
distal half flattened on the dorsal aspect and bearing three keels, a 
median and a pair of lateral; the ventral edge of the median 
orifice coming to a small point but not projecting far beyond the 
dorsal edge; slightly constricted about middle; median foramen 
occupying the ventral aspect of the basal half. Tegmen in form of 
a shield-shaped sclerite, with the corners not meeting on the dorsal 
face, and no trace of prolonged cap. Internal sac small with complex 
armature consisting of a long chitinous flagellum (a) and a pair of 
strong, curved, chitinous spines (b). Stenazygos not investigated. 
Lachnaea palmata. 
In this species the median lobe is well developed, curved near the 
apex, but straight beyond. The armature on sac consists of a small 
spine-like flagellum and a pair of large spines, with a complex 
process closing the median orifice consisting of a plate bearing a 
median curved tongue and a pair of lateral, rounded plates. The 
tegmen is Y-shaped, the strut being slender and bifurcate at end. 
Saxinis saucit. 
Median lobe very slightly curved, with the ventral edge of median 
orifice pointed and extending slightly beyond dorsal edge; the 
median orifice closed by the armature on the sac. Median foramen 
occupying the ventral portion of basal half. Tegmen V-shaped. 
Cryptocephalus aureolus. 
Median lobe well developed and chitinised, the distal half being 
considerably flattened; the ventral edge of medium orifice drawn 
out to a fine, flattened point, with the tip curved downward, pro- 
jecting much beyond the dorsal edge ; median foramen occupying 
the whole of the ventral side of the basal half. Tegmen shield- 
shaped, with a keel along the middle of the inner side. Armature 
on sac not examined. 
Cryptocephalus asturvensis ? 
Of the same type as C, awreolus, but the ventral edge of the median 
orifice drawn out into a blunt point and not turned downward. 
Armature on sac complex, that at the base closing the median for- 
amen ; at the apex there are two broad, bifurcated spines and a 
flattened median sclerite, but no flagellum. 
Humolpus surinamensts (Pl. LX XIII figs. 207, 207a). 
The apical third of the median lobe strongly curved and slightly 
flattened, the ventral edge of the median orifice pointed and pro- 
jecting far beyond the dorsal edge, the basal two-thirds consisting 
