THE LEPTOCORISINAE OF THE WORLD 97 



Rhabdocoris arcuata Kolenati, 1845, without data (R. A. Kywakeeuya), with label 

 " Rhabdocoris arcuatus Klti ", " Mel II, 67 ", Zool. Mus. Leningrad ; 1 <$, China : 

 Komai (Sanganchu) in Tibet, with label " trinotatus " " Herrich Schaffer, fig. 863 ", 

 Riksmus. Stockholm. 



Other material. Ceylon : 5 £, 1 $ ; India : 23 <£, 18 $ ; Nicobar Island : 

 4 <J ; Pakistan : 1 <$, 2 $ ; Bhutan : 40 $, 25 $ ; Burma : i $ ; Thailand : 

 19 (J, 13 $ ; Vietnam : 32 <$, 28 $ ; Malaya : 5 <$, 3 $ ; Singapore : i <J ; Su- 

 matra : 1 (J ; Java : 38 <£, 18 $ ; Sarawak : 40 <J, 37 $ ; Celebes : 2 (J, 2 $ ; 

 Philippine Islands : 157 g, 128 $ ; Australia : 4 ^, 4 $ ; Solomon Islands : 

 2$. 



The range of this species extends in the west into Ceylon, in the north to Malabar, 

 Sylhet (East Pakistan), Bhutan, China (Komai in Tibet) in the south into North 

 Queensland (Australia) and in the east as far as Solomon Islands. 



Uichanco (192 1) has stated that its common name in India, China and Java is 

 " Waleng sangeet ", but in the Philippines, it is called by various common names 

 such as Tagalog, Bicol, Visayun, Pangasinan, Panpanga, Ilacano and Moro. It is 

 a serious rice pest in the Far East countries and, to quote Uichancho, " of the insect 

 enemies of rice there is probably none that is so well known among the Filippino 

 planters as the rice bug Leptocorisa acuta Thunberg ". The figure he gives of the 

 pygophore makes it clear that he was referring to this species and not L. acuta s. str. 

 He has estimated that in abundance, it destroys at times over one-half of the season's 

 crop. It causes the greatest damage in the months of November and December, when 

 the rainy season rice is in the milk stage. Its life history has also been studied by 

 Koningsberger (1903) and Zehntner under the name of Leptocorisa acuta (Thunberg). 

 It has also been collected at light in Java. 



This species is close to L. acuta (Thunberg) and L. chinensis Dallas but can easily 

 be separated by a series of ventro-lateral black dots on abdomen. In <$ the claspers 

 which posteriorly taper into a point and in the $ the first pair of elongated and pointed 

 gonocoxae are its peculiarities. 



Stal (1873) synonymized the following species : 



Cimex acuta Thunberg, Cirnex angustata Fabricius 1787, Gerris oratorius Fabricius 

 1794, Leptocorisa bengalensis Westwood 1842, Rhabdocoris arcuata Kolenati 1845, 

 Myodochus trinotata Herrich Schaffer 1848 and Leptocorisa maculiventris Dallas 1852. 

 During the present study the holotype of acuta Thunberg has been examined and 

 because of its damaged abdomen, another male specimen (from type locality) and 

 with Stal's label " Cimex acutus Thunb. ! Mus. Thunb. " has been designated neotype 

 of C. acuta Thunberg (see page 80). The type of C. angustata Fabricius has been 

 found to be identical with C. acuta Thunberg. The types of Gerris oratorius Fabri- 

 cius, Leptocorisa bengalensis Westwood and Rhabdocoris arcuata Kolenati all differ 

 from the type of acuta (J. S. varicornis) and represent the modern concept of L. acuta 

 China nee Thunberg 1783. This acuta auctt., which is now without a name, should 

 take the name of the most senior synonym, i.e. Gerris oratorius Fabricius 1794. The 

 types of M. trinotata Herrich Schaffer 1848 and L. maculiventris Dallas could not 



