| Sumario: | Mature larvae and pupae of Metachorema griseum Schmid are described for the first time. The known distribution of the genus includes the province of Neuquén in Argentina and central and southern Chile. The distinctive characters of the larvae of this genus are: (1) prothoracic sternite consisting of a wide subrectangular central sclerite and a pair of elongated lateral sclerites, (2) anterior femora with a narrow basodistal process, (3) anterior tibia and tarsus fused and (4) anal prolegs with a short lateral sclerite with basal spine and claws simple with ventral spine and two ventral setae.
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