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Note on Throi<ci(ltum invmbile ; by the Kev. A. Matthews, 

 M.A. 



When I made the figure of '/'richopteryx invisibiUs, (Trichop. 

 lUustr. pi. 24, fig. 10), I could not but perceive that it differed 

 very mucli from any of the species with Avhich it was associated; 

 but the fact of possessing at that time only two specimens, 

 (original types from H. Nietner, kindly presented to me by 

 Dr. Kraatz and Dr. Dohrn respectively), together with the 

 minute size, and extremely delicate and fragile structure of the 

 insect, deterred me from making any anatomical examination. 

 Since that period ]\Ir. Wollaston met \vith this species in the 

 Cape de Verde Islands, and, as he always did, enriched any collec- 

 tion with a third type specimen. 'Sir. Wollastou's protracted 

 absence from England, and his lamented death, occurring so 

 soon after his return to this country, again prevented my making 

 the desired investigation. I have however at last been enabled 

 to do this through the kindness of ]Mr. Dale, in whose hands 

 Mr. Wollastou's collection is now placed. By a careful examina- 

 tion of its anatomy I am convinced that the species in question 

 belongs properly to the genus Throscidiam, and not to TricJwp- 

 teryx, and must in future be known as Throscidiam invisibile. 



I think that any one who will compare the figure of T. invisi- 

 bilis, (Trichop. Illustr. pi. 24, fig. 10), with Th. Germainii 

 (pi. 20, fig. 4), will feel quite satisfied that this change of genus 

 is correct. 



T. invi'<lbile seems to be distributed throughout the tropical 

 zone. It was first discovered in Ceylon, by H. Nietner, sub- 

 sequently by Mr. Wollaston in the Cape de Verde Islands, and 

 by Colonel Motschulsky, near Panama, and described by that 

 illustrious Entomologist as Aci'ati-ichis elongatula. 



It has also more recently been taken by Mr. Champion in 

 Central America, 



