E. BERGROTH, HEMIPTERA FROM BRITISH EAST AFRICA. 17 



libus quam anteapicalibus multo brevioribus, furca prima 

 venae raclialis quam furca prima venae mediae e cellula basali 

 magis distante, stigmate tricellulato, venis clavi ad medium 

 ej US conjunctis. Tibiae posticae ut apud D. astigmaticam 

 armatae. Long. (^$ 5,5 mm., cum tegm. 7,8 mm., exp. tegm. 

 14,8 mm. (Mus. Stockholm.) 



Mas: gonaphysis tergalis utrinque anguste lobato-deflexa, 

 lobis in dentem acutum incurvum fuscum desinentibus, stylo 

 unico inter lobos dentato-prominente ; penis robustus, latiuscu- 

 lus, testaceus, basi et apice piceus; gonapophyses ventrales 

 in latere exteriore carina perobtusa et paullo ante medium 

 hujus dente fusco instructae, parte apicali ut in D. astigmatica 

 constructa, sed majore et latiore dimidioque postico fuliginosa. 



Guaso Nyiro. 



This species is nearly allied to the preceding one and gives 

 at first sight the impression of be ing a variety of it, but on closer 

 inspection it proves to be quite distinct in the structure of 

 the head, the keels of the prothorax, the venation of the teg- 

 mina, the coloured stigma, the lack of black stripes to the 

 legs, and the structure of the genitaha. The male tergal gonapo- 

 physis is quite different in shape, but the ventral gonapo- 

 physes have in both species the shape of a crochet-hook, 

 being, however, in D. devincta larger and broader and broadly 

 fuliginous a t apex. The genital segments of both sexes af förd 

 very good specific characters in the Dictyoj^horinae, as in most 

 other Fulgoridae, and if we have to deal with closely related 

 forms, we cannot arrive at a final decision as to the specific 

 distinction of a form without an examination of the genitalia. 

 The disregard of the genital characters is a much-felt defi- 

 ciency in Melichar's monographs. Matsumura is almost 

 the only author that has paid some attention to the sexual 

 characters of the Dictyopharinae, but his descriptions of the 

 genital segments are not very clear. Both the dorsal and the 

 ventral gonapophyses are movable, and if in a dried male 

 specimen the ventral ones be contiguous to each other and 

 the dorsal one withal bent down över their ends, it is no use 

 trying to describe the genitals, as neither the penis nor the 

 characteristic apices of the gonapophyses are freely visible. 

 In such cases the whole propygium must be made pliant by 

 moisture, af ter which the tergal gonapophysis is lifted up 

 and the ventral ones spread oat. In the females the genitals 



Ärhiv för zoologi. Bd 12. No 17. 2 



