Mesostenus pertenuis Cresson, 1874

Distribution: Nearctic and Neotropical (Mexico, United States).

Habitat: Coastal dune scrubland, savannah, dry forest.

Phenology: Appendix I (Fig. 31).

Studied material: MEXICO. Yucatán State, Ría Lagartos Biosphere Reserve, Ría Lagartos Station, Post 024: 18.III–01. IV.2009, 1 3. Cuyo Station, Punta Meco: 10–24. IX.2008, 1 Ƥ. Sacbo: 14–28. VII.2008, 1 3; 12– 28. VIII.2008, 1 Ƥ; 28.VIII–10. IX.2008, 2 33; 23.XII.2008 –07. I.2009, 1 Ƥ (CER– UADY). Tekal: 01– 14. VII.2008, 1 3; 14–28. VII.2008, 1 Ƥ, 1 3; 28.VII–12. VIII.2008, 1 3; 04–18. II.2009, 1 Ƥ, 2 33; 04– 18. III.2009, 2 33 (CEUA).