Limonia (Dicranomyia) guamicola, Alexander, 1942

Alexander, C. P., 1942, Diptera, Tipulidae of Guam, Insects of Guam I, Honolulu. Hawaii: Bernice P. Bishop Museum, Bulletin, 172, pp. 195-198 : 196-197

5. Limonia (Dicranomyia) guamicola , new species ( fig. 1 , a, b).

Belongs to the punctulata group; size large; general coloration of thorax reddi5h brown, variegated with darker, including a narrow brownish black pleural stripe; male hypopygium with a single rostral spine that is placed far out at tip of prolongation; mesalapical lobe of gonapophysis slender, nearly straight, blackened. Male, length about 8 mm., wing, 9 mm.

Rostrum and palpi black. Antennae black throughout; flagellar segments oval to longoval; terminal segment about one-fourth longer than the penultimate. Head blackish gray; anterior vertex reduced to a linear strip that is about as wide as a single ommatidium.

Pronotum brown. Mesonotum reddish brown to huffy, with poorly differentiated, pale brown stripes, the intermediate pair darker and more conspicuous near the suture; scutal lobes more darkened; mecliotergite darkened on cephalic portion; pleurotergite dark brown, more or less pruinose. Pleura buffy, with a narrow brownish black longitudinal stripe from the cervical sclerites across the propleura, ventral anepisternum and ventral pteropleurite to the base of abdomen. Halteres yellow, the small knobs very weakly darkened. Legs with the coxae yellow, the fore and middle pairs narrowly infuscated at base; trochanters yellow; femora pale brown, the bases brightened, the tips vaguely darkened; tibiae and tarsi pale brown, the outer segments darker; claws elongate, simple. Wings ( fig. 1 , a) brownish yellow, sparsely patterned with brown as in the punctulata group, including the usual two spots along vein 2d A; cells C and Sc unpatternecl or the former with two or three pale brown clouds near outer encl; veins yellow, darker in the clouded portions. Venation Sc1 ending a short distance beyond origin of Rs, Sc2 at its tip; m-rn shortly be~nd fork of lvl.

Abdomen reddish brown, the basal segments somewhat darker; hypopygium obscure yellow. Male hypopygium ( fig. 1 , b) with the tergite extensive, the caudal margin gently emarginate, lateral lobes rounded. Dorsal clististyle, dd, a slender curved rod, the tip acute and very gently upcurved. Ventral clististyle, vd, large, more extensive than the basistyle; rostral prolongation conspicuous; a single powerful spine placed far out on the prolongation, without a basal tubercle. Gonapophyses, g, with mesal-apical lobe slender, nearly straight, blackened. Aecleagus, a, terminating in a simple narrow point.

Piti, at light, June 12, Swezey, holotype male .

In its large size and in the structure of the male hypopygium, the present fly is quite distinct from all species of the group so far made known. In the structure of the male hypopygium, it is closest to L1'1nonia (Dicranoniyia) neopunctulata Alexander , of the southern Philippine Islands and Borneo, differing especially in the structure of the dististyles and gonapophyses. The species belonging to the punctulata group are as follows:

L. (D.) fijiana Alexander. Fiji.

L. (D.) fullawayi Alexander. Laclrones, Carolines.

L. (D.) lwlin Alexander. Southeastern Australia.

L. (D.)) magnistyla Alexander. New Britain.

L. (D.) 11-eopwictulata Alexander. Mindanao, Borneo.

L. (D.)) poli Alexander. China, Japan.

L. (D.) punctipemzis Skuse. Eastern Australia.

L. (D.) p. maoriensis Alexander. New Zealand.

L. (D.)) p. occidentalis Alexander. Western Australia.

L. (D.) pzmctulata de Meijere. East Indies.

L. (D.) pzmctulatella.Alexander. Northeastern Australia.

L. (D.) punctulatoides Alexander. Mindanao.

L. (D.) rectide11 sAlexander. China.

L. (D.) subpwzctulata Alexander. Formosa.

Figures

FIGURE 1.-Limonia (Dicmnomyia) guamicola, new species: a, venation; b, male hypopygium, symbols: a, aedeagus; b, basistyle; dd, dorsal dististyle; g, gonapophysis; gt, 9th tergite; vd, ventral dististyle.