Ischyrothrips crassus Schmutz, 1913

Okajima, Shûji & Masumoto, Masami, 2023, Six genera of the subtribe Macrothripina from Southeast Asia to Taiwan (Thysanoptera, Phlaeothripidae, Idolothripinae), Zootaxa 5291 (1), pp. 1-74 : 66-67

Ischyrothrips crassus Schmutz

( Figs 196–202 , 245 )

Ischyrothrips crassus Schmutz, 1913: 1076–1078 .

This species has previously been known from Sri Lanka and India. Unfortunately, specimens from these two countries have not been available in this study. Two females and one male collected from Thailand listed below may represent I. crassus .

Diagnosis. Body dark brown, antennal segment III and fore tibiae slightly paler. Head ( Fig. 196 ) about 1.6 times as long as broad, cheeks weakly constricted basally; eyes about 1/4 as long as head; postocular setae elongate, situated behind inner margins of eyes; postocellar setae short, situated behind posterior ocelli. Antennal segments III and IV subequal in length; segment VIII weakly constricted basally ( Fig. 197 ). Maxillary stylets V-shaped, scarcely reaching postocular setae. Fore femora well developed, but smaller than head, each with 8–9 small tubercles arranged in a straight line along interior margin; fore tibia weakly ridged along interior margin, with one or two blunt inner apical tubercle(s); fore tarsal tooth stout, wide-based ( Figs 198 & 199 ). Mesopresternum narrowly boat-shaped ( Fig. 201 ). Pelta trilobed ( Fig. 200 ). Tube ( Fig. 202 ) a little longer than head in female. Male very similar to female, but smaller.

Specimens-examined. Thailand, Nakornprathom , Puttamonton, 2 females and 1 male, on dead branches , 18.ix.1991, P. Jangvitaya.

Figures

FIGURES 196–202. Ischyrothrips crassus. (196) Head & prothorax, female; (197) antenna, female; (198) fore leg, female; (199) fore leg, male; (200) metanotum & pelta, female; (201) mesopresternum, female; (202) tube, female.

FIGURES 235–246. Macrothripina genera and species. Ethirothrips species 235–243: (235) E. stenomelas, male; (236) E. (?) stenomelas, female from Mindanao; (237) E. tenuis sp. n., female; (238) E. terminalis sp. n., female; (239) E. thai sp. n., female; (240) E. tibialis, female; (241) E. tibialis, micropterous male; (242) E. tibialis, macropterous male; (243) E. virgulae, female. (244) Fernothrips femoralis gen. et sp. n., female. (245) Ischyrothrips crassus, female. (246) Polytrichothrips malayanus sp. n., female.