Styringomyia dorsolineata Alexander, 1945

Ribeiro, Guilherme Cunha, 2003, Systematics of the Neotropical species of Styringomyia Loew (Diptera: Tipulomorpha: Limoniidae), Zootaxa 253, pp. 1-35 : 11-13

Styringomyia dorsolineata Alexander, 1945 , nomen dubium

Styringomyia dorsolineata Alexander, 1945a: 419 (description).

MATERIAL EXAMINED. Holotype. Male, Ecuador, El Oro, Morro Morro (3º41S, 76º35W), 1500 m, 20­VII­1941, Laddey ( USNM). Most of the specimen pinned together with allotype; right wing and some legs mounted on separate slide.

DESCRIPTION. Dimensions. See table I.

REMARKS. As for S. americana , the identity of this species cannot be identified from its name­bearing type due to the lack of information on the diagnostic structure of the male terminalia. Alexander (1945a) diagnosed this species by the relatively high degree of pigmentation of the first abdominal tergites, the general effect being a dorsal longitudinal median stripe along the abdomen. However, the abdomen of the holotype is broken at the level of the fourth segment, and its degree of pigmentation is not particularly different from the condition found, for example, in some specimens of S. maya sp. n., or in S. simplex , in which a longitudinal median stripe along the abdomen can be clearly observed. It was already stressed by Alexander (1945a: 419) in describing the species that: It is unfortunate that the hypopygium of the holotype male is lost, since the decisive specific character are to be found in this structure.

τABLE I• SeIeʗʈed meaSuɾemenʈS 0ſ Ne0ʈɾ0piʗaI ʄʈJr¡flǥ0fflJ¡d SpeʗieS ﹝in mm﹚∗•

Maximum length Maximum width ••••••ƈ0nʈinfled τABLE I (cΟnʈínueđ)•

Maximum length Maximum width * The sex of the holotype of S. americana could not be identified unambiguously. For all other species, the measurements were taken from male specimens. The way of preservation of specimens may influence the dimensions of structures. The symbols (), [] and [] enclosing each n value identify the specimens preserved on pin, slide, and glycerin, respectively. Since metric data are not used in this review to diagnose species, there was no concern in taking measurements from large series to give an exhaustive description of the range of the dimension of any of the measured structures.