Two new species of Costa Rican Heteropteron 151 Two new reared species of Heteropteron Brullé (Hymenoptera, Braconidae, Cardiochilinae) from northwest Costa Rica, with the first definitive host records for the genus Elizabeth Zhu Dabek 1,2 , James B. Whitfeld 1 , Winifred Hallwachs 3 , Daniel H. Janzen 3 1 Department of Entomology, 320 Morrill Hall, 505 S. Goodwin Ave, University of Illinois, Urbana, IL 61801, USA 2 Department of Entomology, Plant Sciences Building, 4291 Fieldhouse Dr, University of Ma- ryland, College Park, MD 20742, USA 3 Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA Corresponding author: James B. Whitfeld (jwhitfe@life.illinois.edu) Academic editor: G. Broad  |  Received 28 January 2020  |  Accepted 11 June 2020  |  Published 29 June 2020 http://zoobank.org/CC501B40-0C38-419A-A620-D93A5F007CBD Citation: Dabek EZ, Whitfeld JB, Hallwachs W, Janzen DH (2020) Two new reared species of Heteropteron Brullé (Hymenoptera, Braconidae, Cardiochilinae) from northwest Costa Rica, with the frst defnitive host records for the genus. Journal of Hymenoptera Research 77: 151–165. https://doi.org/10.3897/jhr.77.50577 Abstract Two new Costa Rican species of the braconid parasitoid wasp subfamily Cardiochilinae, Heteropteron kidonoi Dabek & Whitfeld and Heteropteron hasagawai Dabek & Whitfeld, are described and illustrated from dry forest in the Area de Conservacion Guanacastae, along with data on rearing from their hosts. Heteropteron kidonoi is a solitary endoparasitoid of Stenoma cathosiota (Lepidoptera: Depressariidae) on Roupala montana (Proteaceae), while H. hasagawai is a solitary endoparasitoid of Carthara abrupta (Lepi- doptera: Pyralidae) on the same host plant, but typically at slightly higher elevation localities. Diagnostic characters are provided to distinguish these two new species from each other, and also from the three previously decsribed species of Heteropteron. Heteropteron kidonoi and H. hasagawai are the frst species of Heteropteron to have any host data, and also are the frst to be reported in Costa Rica. Keywords Carthara, Depressariidae, Parasitoid, Proteaceae, Pyralidae, Roupala, Stenoma JHR 77: 151–165 (2020) doi: 10.3897/jhr.77.50577 http://jhr.pensoft.net Copyright Elizabeth Zhu Dabek et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. ReseARCH ARTiCle