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The genus Trichoprosopon Theobald, 1901 includes 13 described species in the Neotropical Region, three of which have been recorded in Mexico. In this work, a new species, Trichoprosopon mixtli sp. nov., is described based on characteristics of the fourth-instar larva, pupa, female and male genitalia, and adults. Larvae and pupae were collected from the flower bracts of Heliconia bourgaeana Petersen at the Instituto de Ecología, A.C. (INECOL), inside the "Santuario del Bosque de Niebla", in Xalapa, Veracruz State, Mexico. This is the first time that the complete larval and pupal chaetotaxy of a species of Trichoprosopon is described. Keys for the identification of known species of Trichoprosopon are provided and the internal classification of the genus is discussed.

Aedes (Howardina) guatemala Berlin, 1969 was recently recorded in Mexico. Based on material collected in Chiapas State, the larva, pupa, and female and male genitalia of this species are described for the first time.

Eleven species of Uranotaenia, one belonging to the subgenus Pseudoficalbia and ten to the subgenus Uranotaenia, have been recorded in Mexico. In general, two species are commonly recorded in urban areas by the vector surveillance programs, but the other species are rarely collected as they occupy habitats in non-anthropized environments, and for that reason they remain poorly known. Some of the species recorded in Mexico have not been described in the pupal stage and other developmental stages have only been partially described, making their recognition difficult. One of these species is Uranotaenia (Uranotaenia) coatzacoalcos Dyar Knab, as a complete description of its larval chaetotaxy is not available, and the pupa has not been described. In this report, we provide a complete morphological description of the fourth-instar larva, the first description of the pupa, and a review of the female and male diagnostic characteristics useful for recognition of the species. We also provide keys in English and Spanish for the recognition of the larvae, pupae, females, and male genitalia of the species of Uranotaenia recorded in Mexico.

Description of the pupa and redescriptions of the larva, female, male and male genitalia of Toxorhynchites (Lynchiella) moctezuma (Dyar Knab) are presented based on specimens from Mexico, providing information that helps to distinguish this species from other species within the subgenus Lynchiella. Additionally, we report the first finding of Tx. (Lyn.) grandiosus (Williston) in the state of Veracruz, Mexico.

The pupa of Culex (Culex) bidens Dyar is described based on specimens from Mexico. The pupa is compared with the pupae of Culex (Culex) declarator Dyar Knab and Culex (Culex) interfor Dyar, similar species which are easily confused with Culex bidens.

Changes in the specialization of parasite-host interactions will be influenced by variations in host species composition. We evaluated this hypothesis by comparing the composition of bats and bat flies within a roost cave over one annual. Five bat and five bat fly species occupied the cave over the course of the study. Bat species composition was 40% different in the rainy season compared with the dry-cold and dry-warm seasons. Despite the incorporation of three new bat species into the cave during the rainy season, bat fly species composition was not affected by seasonality, since the bats that arrived in the rainy season only contributed one new bat fly species at a low prevalence. Bat-bat fly ecological networks were less specialized in the rainy season compared with the dry-cold and dry-warm seasons because of the increase of host overlap among bat fly species during this season. This study suggests that seasonality promote: (1) differences in host species composition, and (2) a reduction in the specialization of host-parasite ecological networks.