Differences between D. crassi and D. insularis (= D. assimilis)

Denticles on claw. According to the original descriptions of the Madagascar species D. insularis and D. assimilis, they both differ from D. crassi by edentate claws, while claws of D. crassi have small denticles (Figs 35–37). More careful examination of the holotype of D. insularis, done by Luke Jacobus, and the type series of D. assimilis, done by Jean-Luc Gattolliat, reveals that claws of these larvae have vestigial denticles (Fig. 38), which are much smaller than denticles of D. crassi .

Denticles on paraproct. The paraproct of D. crassi is caudally stretched into a narrowed projection, so that the median margin of the distal part of the paraproct has a shallow concavity; marginal denticles located on the caudal projection of paraproct, are turned medially (Fig. 43); in contrast to this, in D. insularis (= D. assimilis) the paraproct has a more usual structure, with the median margin entirely convex and all marginal denticles directed caudally (Fig. 44; Lugo-Ortiz & McCafferty 1998: fig. 10; Gattolliat 2003: fig. 10). Lugo-Ortiz & McCafferty (1998), distin-guished D. insularis from D. crassi «by ... numerous small spines of the paraproct», but did not report the source of information about the paraproct structure of D. crassi . Actually, spines (denticles) on the paraproct of D. crassi are also numerous and small, but differently directed (Fig. 43).

Shape of tergalii. Tergalii of D. crassi are so greatly widened that tergalii III–V have their anal lobes projected proximad of the base (Figs 47–49), while tergalii of D. insularis are less widened (Gattolliat 2003: fig. 12).