129 VOL. 46, NO. 1 SOUTHWESTERN ENTOMOLOGIST MAR. 2021 Population Dynamics of the Predator Mite Bdella longistriata 1 Collected by Malaise Trap at Tula, Tamaulipas, Mexico Martha Patricia Chaires-Grijalva 2,5 , Ignacio Mauro Vázquez-Rojas 3 , Blanca Estela Mejía-Recamier 4 , Enrique Ruíz-Cancino 1 , and Juana María Coronado-Blanco 1 * Abstract. Bdella longistriata Atyeo is a mite with restricted distribution that has been registered in the United States of America (Texas) and Mexico (Colima, State of Mexico, Guerrero, Jalisco, Morelos, San Luis Potosí, and Tamaulipas). Were colected 130 mites in different stages of development, except larvae and eggs. Population structure collected by the Malaise trap were 85% females, 9% males, and 6% immature stages. The mites were compared with those collected in a Berlese funnel from a tropical deciduous forest in the State of Jalisco. Introduction Bdellid mites tolerate cold weather, heat, and low humidity. They are found on the surface of organic soil or in more specialized habitats such as mosses, lichens, and tree bark, and have been found even under mosses and rocks near waterfalls, in pine cones, in arid soil, on grasses in swamps, and on agricultural products (Atyeo 1960, Fisher et al. 2011, Hernandes et al. 2016). The genus Bdella is known worldwide; some members of the genus are biological control agents for mites, springtails, and insect eggs (Gerson et al. 2003). Seven species of the genus Bdella occur in Mexico: Bdella cardinalis Banks, Bdella distincta Baker & Balock, Bdella longicornis Linnaeus, Bdella longistriata Atyeo, Bdella muscorum Ewing, Bdella tlascalana Vitzthum, and Bdella tropica Atyeo (Baker and Balock 1944; Atyeo 1960; Mejía-Recamier 1986, 1997; Mejía-Recamier and Cutz 2007; Hernandes 2013; Hernandes et al. 2016). B. longistriata is an endemic species distributed only in Mexico and the United States on the American Continent (Hoffmann and López-Campos 2000, Hernandes et al. 2016). In Mexico, it was recorded on leaf litter, moss, epiphytic moss, corticicoles mosses, epiphytes, and under logs in the states of Colima (Municipality Manzanillo), Guerrero (Taxco), Jalisco (La Huerta), State of Mexico, Morelos (Tepoztlán), San Luis Potosí (Ciudad de Maíz), and Tamaulipas (Antiguo Morelos, El Mante, and Llera de Canales) (Atyeo 1960; Mejía-Recamier 1986, 1997; Mejía-Recamier and Cutz 2007). Considering this, more data are needed on the distribution, biology, and ecology of predator bdellid 1 Bdella longistriata Atyeo, 1960 (Acari: Prostigmata: Bdellidae) 2 Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas. Centro Universitario Victoria. CP. 87149, Cd. Victoria, Tamaulipas, México. 3 Laboratorio de Acarología "Anita Hoffmann", Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México. CP 04510 Ciudad de México. 4 Laboratorio de Microartrópodos, Dpto. Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México. CP 04510 Ciudad de México. 5 Estancia postdoctoral/ Consejo Nacional de Ciencia y Tecnología (CONACyT). *Corresponding author: jmcoronado@docentes.uat.edu.mx