330 



PSYCHE. 



Simnliitm examined presented no differ- 

 ences in moutliparts structure. 



are free and independent to their bases. 

 Tlie hypopharynx (fig. 3, hyp) is a little 



Chironomidae. 



Ceratopogon sp. The mouthparts of 

 females present, as shown in figure 3, 

 parts similar to those described for the 

 Blepharoceridae and the Simuliidae. 

 The well-chitinized labrum-epipharynx 

 (fig. 3, //-' ) is elongate, broad at base 

 and tapering to a blunt tip which bears 

 two minute processes of the character 

 of those of the Simuliid epipharynx. 

 The mandibles (fig. 3, md) articulating 

 on either side of the labrum-epipharynx 

 are, with it, borne by a portion of the 

 head capsule produced anteriorly so 

 that the bases of labrum and mandibles 

 lie considerably in front of the bases of 

 maxillae and labium. Each mandible 

 articulates with a slight projecting 

 process of the head capsule. The 

 mandibles are strongly chitinized, elon- 

 gate, narrow with convex outer margin, 

 and with a few strong, sharp teeth (den- 

 tations) on the apical inner margin. 

 The fnaxillae (fig. 3 iil\) consist of 

 slender 5-segmented palpus {inx. p) and 

 single blade-like maxillar lobe {?nx. I) 

 reaching to end of second palpar seg- 

 ment. The labium (fig. 3 //) bears but 

 two terminal lobes, the paraglossae, and 

 these appear to be 2-segmented. They 



Fig. 3, Mouthparts o£ Ceratopogon sp., ? ; 

 //' labrum-epipharynx, fiid mandible, mx 

 maxilla, ?«x. / maxillar lobe, mx. p maxillar 

 pnlpiis, //' labium,/^ paraglossa, /lyp hvpo- 

 pliaiN nx. 



broader than the labrum-epipharynx, is 

 weakly chitinized, and is weakly but 

 conspicuously serrate at its apex. 



The males of Ceratopogon have no 

 mandibles, and the maxillae have no 

 terminal lobe, and only 4-segmented 

 palpi. 



Chironomus sp. In females of C/tiro- 

 nomus we meet a mouth structure differ- 

 ing essentially from that of females of 

 Ceratopogon in that there is lacking in 

 Chironomus the mandibles and the 

 maxillar lobes. The mouthparts of 

 Chironomus are also short and broad 

 and not elongate as in Ceratopogon. 

 Chironomus does not possess, as Cera- 

 topogon does, piercing mouthparts. 



Exchange desired. — Dr. A. Griftini of 

 the University of Turin, Italy, desires to 

 obtain American specimens of Cybister and 



Dytiscus, pinned or in alcohol, in exchange 

 for Italian insects of any order- Address as 

 above. 



