Ischnogomphus Williamson 1921

Williamson 1921. Two new neotropical genera of Lestinae (Odonata). Occasional Papers of the Museum of Zoology University of Michigan Ann Arbor, No. 96 1921: pp. 1-9

Williamson 1918. Results of the University of Michigan-Williamson Expedition to Colombia, 1916-1917. I-III. Occasional Papers of the Museum of Zoology University of Michigan Ann Arbor, no. 52 1918: 14 pp.