Amasa umbratula ( Schedl, 1975 )

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, Taxonomic Changes For Indo-Malayan Ambrosia Beetles (Coleoptera: Curculionidae: Scolytinae: Xyleborini), The Coleopterists Bulletin 74 (1), pp. 37-40 : 38

Amasa umbratula ( Schedl, 1975) , status restored

Xyleborus umbratulus Schedl 1975: 221 .

Amasa umbratulus [sic] (Schedl): Wood and Bright

1992: 684.

Hulcr and Cognato (2013) placed the Papua New Guinean species A. striatotruncata and A. umbratula in synonymy with A. schlichii . Our justification for restoring this species is as given above for A. striatotruncata . Amasa umbratula is distinguished by a shagreened and opalescent declivity, declivital interstria 1 feebly inflated and armed with a few granules near apex, and declivital interstriae with punctures smaller than those of A. schlichii and the integument among the punctures is shagreened and shiny. Amasa schlichii can be distinguished by larger, deeper strial punctures, the strongly shiny integument among the punctures, and declivital interstria 1 inflated and armed with dense, numerous granules from the elytral apex to near the midpoint.