MALLOPHAGA. 555 



tinct jaws. The flattened body is corneous, hard above, and 

 the head is horizontal, with three to five-jointed antennae ; the 

 eyes are small and simple ; the mandibles are small, like a 

 hook, and the maxillary palpi, when present, for they are some- 

 times wanting, are four-jointed, while the labial palpi are two- 

 jointed. The thorax is small ami Init two-jointed apparently, 

 as the meso- and metathorax are united together. The abdo- 

 men is from nine to ten-jointed, while the short thick limbs 

 have two-jointed tarsi and one or two claws. 



These insects are considered b}^ Burmeister as forming a 

 passage from the Heraiptera into the Orthoptera, as they pos- 

 sess free biting mouth-parts, especially free mandibles, which 

 are not as in the rest of the suborder fused together with the 

 other parts to form a sucking tube. Docophorus buteonis Pack, 

 (pi. 9,* fig. 3) lives on the Red Shouldered Hawk; and D. 

 haviatus Pack. (PI. 9, fig. 7) is found on the Snow Bunting. 



Goniocotes Burnettii Pack. (Fig. 5G0) infests the domestic 

 fowl. Lipeurus corvi Pack. (PI. 9, fig. 2) is a parasite of the 

 crow ; L. elongatus Pack. (PI. 9, fig. 

 4), and L. gracilis Pack. (PI. 9, fig. 

 6) are long and slender forms. In 

 the genus Pliilopterus of Nitzsch the 

 antenuie are filiform, five-jointed, and 

 the labial palpi are wanting. Nir- 

 mus is an allied genus ; both live on 

 birds. N. thoracicus Pack. (PI. 9, 

 fig. 5) lives on the Snow Bunting. 



Trichoclectes amis DeGeer lives on 

 the dog, and has three-jointed an- 

 tennae. The females have two mov- 

 able hooks on the penultimate ring of 

 the alxlomen. T. subrostnttus is a 



parasite of the cat. T. capne Pack., lives on the goat. The 

 Saddle-ljack Gull is inhabited by Colpocephalum lari Pack. (PI. 

 9, fig. 1). Gyropus has no labial palpi. G.porcelli Schrank is 

 a third of an inch long and lives on the Porpoise. Mr. C. 

 Cooke has found G. oralis on the Guinea pig in this country. 



*E.XPLANATiox OF PLATE 9. — Fig. 1, Colpocephalum lari Pack.; lu, autenna; 

 Fig. 2. Lipeurus cor i-i Vixck. ; 2n, antenna; Fig. 3, Tiocophorus buteonis Pack.; 3a, 

 antenna; Fig. 4, Lipeurus elongatus Pack. , 4rt, antennsc; Fig. 5, \irinus thoracicus 

 Pack.; Fig. C, Lipeurus gracilis Pack.; Fig. 7, Docoj)horus hamatus 'Pack.. 



