Loxaulus hyalinus Pujade-Villar y Melika, In Pujade-Villar et al. (2014c: 344)

Gall (Fig. 6b): An elongated swelling of the stem, approximately 2.0 times the normal diameter of the bud (8 x 40 mm). The galls are at the tip of the previous year's shoots. The surface of the gall is rough, colored like the bark. The larval chambers (1.5 x 1 mm) are dispersed in the inner tissue of the twig, oriented along the longitudinal axis.

Hosts: Quercus laeta (section Quercus). In the original description, Q. dysophylla (section Lobatae) is mentioned as a host, but this citation needs to be confirmed.

Biology: Only the sexual generation is known (see comments). The galls begin to be recognized in September, when the swelling of the twigs is barely noticeable; by December they are more developed. Adult emergence begins in late April, first males and then females a few days later; adult emergence continues until mid-May.

Distribution: Mexico (Hidalgo); first record for Santa Fe (Mexico City).

Comment: In the original description, it was assumed, since only females were obtained, that this was an asexual generation. Now, after the emergence of males, we know that the collections that led to the description of the new species correspond to late females. Loxaulus hyalinus is therefore the sexual generation of a species of which the asexual form is unknown. The male will be described shortly.

Loxaulus hyalinus Pujade-Villar & Melika n. sp.

Diagnosis: The galls of L. hyalinus n. sp. are always located on twigs and branches, while galls of L. illinoisensis are in a subterranean stem swelling always at ground level (Weld 1921).

Gall (Fig. 2b). Elongated, slightly enlarged swellings on twigs. The gall surface is rough, colored like the bark. Galls are on the tips of shoots from the previous year. Abrupt stem swelling, approximately 2.0 times the normal diameter of the shoot (8 x 40 mm). The larval chambers (1.5 x 1 mm) are dispersed in the interior tissue of the twig, oriented along the longitudinal axis.

Host. Quercus dysophylla Benth. (section Lobatae) [likely mistaken]. Endemic to Mexico.

Distribution. Mexico (Huasca, Hidalgo).

Biology. Only the asexual form is known [mistaken[. Adults emerge in late winter and early spring, when new shoots start to grow. Parasitoids from Eulophidae, Eurytomidae, Pteromalidae, and Ormyridae were reared from the galls.

Etymology. Related to the color pattern of the forewing, which is hyaline, without smoky spots and/or stripes in the newly described species.